Question on webflow collection items and memberstack

Hi everyone,
I just have a quick question how memberstack/webflow works with users. From what I’ve seen so far, memberstack uses the CMS of webflow to store your users, so how is it possible to have over 10,000 users on webflow then if your limited to 10,000 collection items? I might be overlooking something, because memberstack has an option for unlimited members and webflow has the site plan for unlimited projects, so how can you create a website with more than 10,000 users if each user is counted as a collection item?

Edit: Just the gist of what I’m trying to build, I’d like to create a website where clients can sign in and view their website/make changes/etc on a dashboard, besides just editing from the client portal itself.

Thank you for the help!