The “Have as much as you like” model has never been friendly to me. In the US, restaurants caused a permanent surge in obesity, offering a massive fixed price menu and the new PlayStation Plus subscription model would cause the gaming equivalent.
Everything is good in moderation, but self-control will be tested. Still, aside from that, it will hurt multiple player group lobbies, with newbies jumping in and out of titles to try it and rage quitting as things get more challenging.
I remember struggling to play with a consistent group in the 2021 title Alien FireTeam and, despite being a true Aliens fan, it was no fun playing with randoms and no comms every time.