Look at history. You need a tipping point, but more importantly, you need organised masses and a vision/visionary to get behind.

That’s how Lenin got in power. It’s how the French decapitated their king. That’s why there was a rally at the White house when trump lost the previous election but nobody is doing anything against him now at the states while he dismantles the country.

The instances are structured much like discord, in that you have a separate server for topics/communities. Think of them as servers that can talk to each other. Instead of subreddits you have this.

Regarding Reddit (US company), well, depending on your values and political views, you might see the need and have the desire to not depend on/support the platform.