

Walled gardens are places like Facebook/Twitter/X where one company controls everything you see and do while on the platform.
Client access just means you have to login to see anything. (Again, like Facebook.) Some platforms let you view content without loggon in, but forcing you to create a login gives them a way to start tracking your behaviors and interests.

For the price of a laptop, you can rent that laptop for a year (1 year commitment required) and after the year is over, you will have no laptop.