[salawat]

There is no Hobson's choice in OSS utopia, as the outcome of "app with tracking offered only" is "fork app - tracking".

You can sit there and stew over the gall of those people to do it, but if you piss them off enough, it will happen.

[ben_w]

To the extent you could ever replace WeChat and Alipay with OSS, that's already a possibility today even with closed OSes and App Stores.

To the extent that you can't (network effects or legal obligations or whatever) you still won't be able to if the code of those apps is made available under any license of your choice.