Overall I think this is well written. I agree with @poVoq@slrpnk.net that the section on picking an instance could be improved, since which instance one picks can be rather important, since federation/defederation is dictated by individual instances.
And a minor typo I noticed:
leaving Mastodon out to try
I assume that should be "out to dry".
You may be entitled to compensation! (although the deadline to submit claims passed in 2018)
https://arstechnica.com/tech-policy/2016/06/if-you-used-to-run-linux-on-your-ps3-you-could-get-55-from-sony/