Full disclosure, I run an agency, so do with this information what you wish.
They’re real, sure. We’ve had a couple of clients come to us from there, but weren’t able to take on either of those apps due to tech debt / bad build practices.
As a point of caution, if an agency says they work on a dozen different platforms, it actually translates to ‘we know a lot of platforms, but are very average at all of them’.
You’re better off working with an agency or freelancer who just focuses on Bubble (and possibly Xano/Supabase/common integrations, though that’s not to say that you should use them with Bubble).