OpenHarmony is open source. There are also: Ubuntu Touch and Sailfish OS being developed. Actually I am writing this from Sailfish OS. I can login to my bank using a web browser here in the EU. I have Telegram, Signal clients, maps, sideloaded packages, full terminal - I fully control the phone, in contrast to Android. I don't own and don't need Android phone at all. So definitely more people should usealternatives to closed Android/iOS.