You can, though? Just go buy an Android. There are a billion different options there.
Heck, you can also still buy old-school type flip phones at Walmart.
I do agree that losing app licenses is upsetting. But this is no different than the licensing model for many softwares in the desktop market (e.g. per-user and per-install licenses).
People do this every day. Hundreds of them, at least. Every day.
It's 99% the same experience - except for iMessage users your texts become green instead of blue.
On top of that, you can use many other services for texts, like FB Messenger, WhatsApp, etc.
Beyond that, I don't see why it's Apple's problem that Google and/or other carriers can't make a decent texting experience without Apple making theirs less secure or a shittier experience in the process.
[0] https://www.ftc.gov/news-events/news/press-releases/2022/12/...
Companies, all else being equal, will choose less regulation over more regulation. If TikTok could release outside of the App Store where no one can inspect what they do, they would only release it there. Users addicted to the app wouldn’t suddenly stop using it but now they would be exposed to whatever TikTok feels like doing. They will choose the path of least resistance, not all the paths. It’s not that hard to understand.