Reddit used to be very left-leaning, but I don't think that's true anymore. Even if you look at a community with a conventionally "leftist" moderation like /r/europe you will see a huge amount of authoritarian and outright fascist comments.

Mailspring is not native, but looks more or less native (depending on why you prefer a native app, this might work).

Facebook groups, for their many failings are still miles better than discord tbh

How does a Netflix subscription fix this? So many interesting shows and movies are missing or barely available for a month. The catalog of Netflix used to be good when they were the only streaming service but really, really tanked when every content producer started their own (and removed their stuff from Netflix).

How stable is Tumbleweed compared to Leap? Is Leap suitable for a workstation?

I think they could have established trust in it if they kept at it for a little longer, but they dismanteld their first party studio some 8 months after it was started and downsized the Stadia team pretty quickly.

I think there has been a huge shift in the privacy concerns of the average people. 10-15 years ago we shared our (LIVE) locations constantly and everything defaulted to doing that. People tagged everyone on all photos (with locations) and initially there wasn't even a way to consent to that. Today that sounds really extreme. Now many people will lock down their accounts and they aren't sharing as much as they used to. You are right that the average person doesn't care as much, but it's not entirely true that people are completely careless.