25TB bandwidth per month (hosted videos only)?" mean?

And what does "Optional add on: Unlimited Gurucan bandwidth for $9 per month" mean?

Does this mean gurucan will host the videos? Or does that mean you have to pay someone like wistia / vimeo to host the videos?

I want to use this to replace my $100 / mo teachable account, BUT teachable DOES NOT require me to pay them a monthly fee to host my videos.

If I get 1 code gurucan 125gb, does that mean they will allow 125gb a month that they host? Or does that mean it's only 125gb metered bandwidth from gurucan but I still have to pay another company like vimeo/wistia to store the videos?

And what does $9/month unlimited bandwith mean? Does that mean Gurucan will host?

Thank you.