People had to pay for this app so they should be getting refunds. Why did Tetris need an always online connection anyway? That’s the kind of game you’d want to play when you’re not connected to the internet. They should just be disabling needing to be online so people can still use the app, this is poor form.
EA has to do work to make sure the app functions on newer devices. The game came out how long ago? This is the business model now. If you don't like it, submit feedback to Apple and tell them you want cartridges made for each version of iPhone going forward. That is the only way you get to "own" your games.