Sempa I would simply use apps from Github and Accrescent that are supposed to be trustworthy, until someone tells me otherwise. Nothing from Big Tech.
When there is suddenly commotion about an app changing their terms and stuff in a bad way, I usually switch to something else.
It helps that I don't use many apps anyway. And sometimes you have to use a certain app, like the banking app your bank provides, if you want the convenience, like scanning the QR code on an invoice.
But I saw how many trackers the eBay app uses (in Aurora Store via Exodus, though there seems to be some controversy about that in this forum), so I simply use the website.