I could see this leading to standardizing and outsourcing multiplayer services, which would be interesting.
That being said, before that happens, as a developer I’d be like: here’s a zip file with all of our proprietary stuff ripped out. Have fun spending the next few months getting it to work well. Congratulations, you’re now supporting a game that did poorly enough for us to drop it.
But seriously, go sign it. Long term it should be a good thing.
App wise I recommend just using the progressive web app (install website as app). It works very well, and you always get the latest updates.
For the server, find one that targets one of your interests.