That doesn't matter. For every sarcastic comment online, there will be a certain percentage of people that misses the joke and takes it seriously. Over time, these people accumulate and become a real cultural/political force.
The Trump administration is basically entirely made up of these groups. Read through this list and you'll probably find a conspiracy theory you've personally made a sarcastic joke about at some point in your internet life.
I self-host forgejo on a spare machine in my home. I also set up automatic encrypted backup using Restic on Backblaze (but any S3 compatible host will work). It might not be a perfect backup strategy, but it's good enough for me, and perfectly manageable with my limited skills. Using wireguard, I can easily access it from outside my home. I also get much better uptime than Github lol
Importantly, I do NOT share this with anyone. It's purely for my own private development and personal projects (I have a ton of these). Even when contributing to something on github, I work in a mirror on my private forgejo, and only push to github to create the PR when it's ready.
Any open source projects I've released (I only have a few) go on Codeberg, but I still have a lot of projects I contribute to and rely on that are on Github. That's really the hard part: getting other people to migrate to something else.