Wow — thank you for taking the time to write this out. Honestly, reviews like yours are worth more to us than a five-star with no words, because you actually used the thing and told us what's real. Let me go through your points properly.

First, on sustainability — you nailed exactly the thinking behind PinBoostr, and I'm glad it came through. We got tired of watching LTDs promise "unlimited free AI forever" and then quietly die once the generation bills piled up (sorry you got burned by FoodGlow — that's the exact trap we refused to walk into). So the deal gives you the software for life — scheduler, manual pins, your own images, all free forever with zero credits. AI image generation is the only piece with a real per-use cost, so it stays separate: you get a one-time batch of credits with the deal, and if you run out you just top up with credit packs — no sneaky subscription. And if you'd rather not buy credits at all, you can plug in your own OpenAI key and pay OpenAI directly. Nobody's secretly subsidizing anyone, which is the whole reason it'll still be here in two years.

Now the part I really need to clear up, because a couple of your frustrations are actually us hiding features too well — not features that don't exist.

Growth Brain doesn't need you to run it manually.
That "run it → get 2 pins → it pauses → run it again" loop you described isn't how it's meant to work at all. There's an Auto mode — flip it ON once and it runs quietly in the background on its own, generating and scheduling for you around the clock. You never touch it again. (There's also a Review mode if you'd rather approve each batch first, and you can Pause anytime.)

And that "2 pins" thing isn't a cap — it's Auto Volume doing its job.
It decides how many pins to make based on how much fresh content you actually have, how warmed-up your Pinterest account is, and Pinterest's own rate limits, because hammering a cold account with a fixed number is a fast way to get flagged. As your account warms up and you add more content, it scales the volume up on its own. So the "dripfeed over a week or a month" behavior you're asking for is basically what it's already doing — we just haven't explained it well enough, which is 100% on us.

On the URLs — you actually have full control over this, and it's the part I most want to point you to. Inside Growth Brain, Click settings button -> click the Links tab and hit Choose — that opens the Link Picker, and it's exactly the "let me decide what gets promoted" tool you're asking for. Tag, category, author and plain pages are hidden by default (there's even a "Hide low-value sections" switch keeping them out), so out of the box Growth Brain only touches your real posts.
From there you can go section by section — Hide / Allow / Choose for Posts, Pages, Tags, Categories, Authors — or flip to the Links view and cherry-pick individual URLs one by one.

You can also add "Topics to favor" and "Words to avoid" to steer it further.
So the "review the URLs before it runs" control is genuinely there, right down to the single-link level — we just buried it a click too deep, and clearly you shouldn't have had to hunt for it.

And the Manual Pin feature you asked for?
It already exists — this one's fully on us for hiding it. It's called Pin Lab: you can drop in a destination URL, write your own title, description and alt text, pick a board, upload your own image, and schedule it — no AI, no credits, exactly the "I already know what I want to publish" flow you described. And for the bulk version, Pin Lab takes a CSV upload (up to 500 rows) where you map URLs, titles, descriptions, images and boards and schedule the whole batch at once — with the option to AI-spin the copy if you want it, or skip it entirely.
Please give Pin Lab a spin; I think it covers most of your single + bulk request already.

Now, the things you're right that we're genuinely missing — and these are going on the list because of you:

A real Media Library.
Right now you can upload an image while building a pin and pull from past uploads, but there's no central place to bulk-drop hundreds of images and organize them. You're right, that should exist.

A proper Growth Brain tutorial/video is definitely overdue. The reason it’s still pending is that we’re actively making changes and adding new features. We don’t want to publish a tutorial now only to have it become outdated shortly after.

We’ve got most of the walkthrough prepared, and once the current updates are finalized, we’ll get the video published.

Thank you, genuinely. You've simultaneously reminded us we've got features people can't find. That's a great review. If you ever want a hand setting Growth Brain to full Auto, dialing in the Link Picker, or getting started in Pin Lab, reach out to support and we'll walk you through it personally.