The description indicates that you can have unlimited guests
and in the response offered by the support confirms it (in the 2020 deal but it applies to the present)

https://appsumo.com/products/keepsolid-goals-2020/#q491340

Support tells me that to invite a user you have to create an account

"Please click on" Invite Members "on the admin account then enter the email to invite and send an invitation.

When you click on "plus" it will add the tab for adding email for another guest.

When the invitation is sent, the guest will receive the invitation email and it redirects him to your projects.

Please note, the guest should have had an account in our system. "

So if the guest must be a member, it cannot be unlimited as it occupies the available seats.

Then,
1- Could you please confirm or refute that you can have unlimited guests?
2- If it is possible to have them, could you indicate how to do it? maybe a video and if not possible, they should correct it in the description.

I would love if it is not a current function, consider incorporating it, as well as the export of all the reports and the Mind Maps.

Greetings