let me stop you here.
... So why should I be defending a company that’s worse then the Alternative, that’s obligated to extract the most possible profit from its costumers, that says it is Private, yet sends your backup and Photos unencrypted to murena servers?
You'd have benefited from not stopping there, at least reading the bold parts : nobody has to use Murena servers. You turn on the device, say no, use whatever alternative services you want, that's it. What Murena (not /e/OS) offers is buying a phone with a working deGoogled Android device. There is a market for that. You don't have to buy from them and it's enough. You can criticize it as much as you want, here and elsewhere, and honestly your criticism is welcomed so that they can improve, just don't make things up.
Source : I'm backing up my photos locally with Immich, no Murena account, no Murena services.
Edit: thanks for sharing https://github.com/seedvault-app/seedvault looks interesting.