Switch's Monthly Free Games are only playable for the month. You don't keep them.

[lordsynbios]

Two questions:

Do we know how much the subscription is going to be?

Do we know if this is going to be a set game, or can you choose whatever you like?

I haven't seen/been able to find answers to those questions, so think it's perhaps too early to gauge it against existing services. I get people being up in arms over this, but it isn't coming for a while yet there's time for Ninty to gauge the response and make changes.