If someone like Musk were to take control of Reddit, be prepared. Let's be real, Spez is not even in the same league as Musk in terms of being unpalatable to Redditors so claiming something like "already has been" is ... a choice. But for sure, if someone far worse takes over, there will be an exodus. And frankly, the Fediverse is fully unprepared to handle that, so that'll be fun.
There's four possible legal structures that could be behind a messaging service:
political domain (state, city, ...)
corporate entity (typically for-profit)
clubs (typically non-profit)
individual humans
I think it fits the spirit of the Fediverse best to consider the lower two options.
A club is a free get-together of humans for some purpose, such as sports club, literature club, you could have a Fediverse club. I highly support this approach, because it is non-profit-oriented, lives off donations, and is rooted by responsible individuals who do something good for the community. Also, individual humans can host smaller instances, but as the instances grow in size, having multiple people behind it to back it up could make things more stable over time.
When Musk took over Twitter I deleted all my Tweets and never even visited the site again, blocked on parental filters and through NextDNS.
I had been there since 2006.
I would definitely do the dame for Reddit if Musk took over, and I have been there since like 2010 and have some million total karma across several accounts (mostly on one).
I actually did quit for about a year when they killed 3rd party apps.
Open All, sort by new, click through upvote and downvote buttons randomly.
Sort by hot, open random post, comment something completely wrong and unrelated to the post.
Go to explore, pick random subreddit, sort by top year or all time. Pick random post from the first dozen and repost it back into the same subreddit. Not cross-post, just copy whatever title/image/text/link there are without changing a thing. Bonus points for doing this on subreddits for current events and hitting a frontpage
Do NOT delete the account. The account age and karma will shield you from anti spam/bot protections in case you ever decide to do it again.