What do you think of an account sharing platform？

I don't want to waste another weekend to build a product no one need that is why I'm asking for advice here. I'm trying to build an account sharing platform like "Together Price", which lets users find others why want to buy the same online courses or join the family plan.

Target users:

- Users who find the courses/accounts are too expensive, they can find someone to split the bill and learn together.

- Users who want to find people to join family plans (Like Switch family plan).

Problems:

- Legal problems. Some online courses platform don't want users to share their accounts (Like Leetcode).

- Cheating problems. One of the users (admin) has all authority of the account (When he/she creates the account he/she may fill a backup email to reset the password anytime). The platform may ask the user to auth its third-party account (Github/twitter) before being an admin.

How do you think about this idea? Any comments are welcome :D