Protonmail works with the CIA so definitely wouldn't trust them unless you're with a US backed rebel group.
Nevar
You seem to be inserting emotional reasons into your arguments why Brave shouldn't be used. I'm not convinced. That being said I don't use Brave because the business model is not sustainable in my opinion and if scaled gives too much control into the hands of one company. If Google adopted the same policy for its browser it would be investigated for anti-trust monopoly practices in a heartbeat. You can't have a single company controlling all ads in a browser. Even Google doesn't do this.
"Also I do not like having to run Steam because I feel like that defeats the point of using free OS…"
You're having a cognitive dissonance because of the dialectical nature of Linux's goals with the reality of software in world society. You can't think hyper rationally about linux. It has goals and a mission to provide a free software ecosystem but there are many things it offers that are proprietary. Think about this from a priority perspective: would you rather support a FOSS OS that aligns with your values and compromise by installing Steam and Lutris, or be a purist and say if it can't all be free there's no point at all and I will embrace the proprietary nature of Windows 10? This is the same folly that some ideologies fall into, they are not willing to make compromise because they feel it dirties the goal of their movement, so they participate in the existing world and just complain. Be pragmatic.
Sounds like you want HumHub.org with federation support
This seems like an overreaction for an opt-in addition on something they won't be applying cross-tracking to. Software that scales to a larger audience can be improved via telemetry data collection. Probably more concern here around the recent acquisition and fear of commercialization. It's good to be vigilant but not reactionary.
Takes a big man
The article says it's opt in. Source for opt out?
Yes, you're using a privacy focused platform and if you want to publish information publicly you can post on the fediverse. Out if curiosity what do you mean by privacy and also social media? A closed network?
Maybe Larksuite.com ?
Encrypted Emails between tutanota is enabled by default, so theoretically just having everyone on the tutanota platform would make it easier. Not that that's likely.