most of these services aren't allowed to grow (i.e. not heavily invested in by the people with actual money) if they dont have some form of data mining or thing

most of these services aren't allowed to grow (i.e. not heavily invested in by the people with actual money) if they dont have some form of data mining or things like 'oops we facilitated key generatyion and kept all the keys' etc. If you want to securely communicate, either be smart about it outside of the app you chose. (encrypted or encoded with your own keys / tools where an app is just a medium of transfer) or create your own secure channels (not too difficult these days with good vetted open source implementations of crypto on multiple platforms...) I would say anyone who fully trusts any of these apps, and is worried about their privacy, is contradicting their worries with their behaviour. just google 'signal vulnerabilities' or that for any other of these apps... even if they have some good form of archntecture it's riddled with bugs... people can access your data. live with it, avoid it, or make the actual data incomprehensible for any 'eve' yourself instead of trusting another to do it for you.