My switch is (and will remain) offline. I wasn't aware some games may not play - even some first-party games like super mario 3d allstars needs updating, according to this.
Any number is too many, I agree.
And from my experience, I can just refuse the update every time. Heck, from a speedrunning perspective it's probably better not to update them, since the updates patch out a bunch of tech that makes them more fun to mess around with (easy item dupes in Tears of the Kingdom, easy out of bounds in Mario Wonder).
This payment only funds the console's matchmaking services. The cost of maintaining dedicated servers falls on the devs for third party games, and presumably a different budget for first party ones. So the, admittedly few, games with dedicated servers (e.g. Splatoon 1) can't survive in this payment model either.
I'm guessing the matchmaking is part of the Wii U's shared online services and not game-specific.