It might be standard practice, but it is somewhat bad in that it destroys potential value. This does not mean that it is net negative, just that defederation is a cost.
All social media has network effects, in which the value to a user is roughly proportional to the number of other users (probably not fully proportional at the high end, but definitely positively sloped).
This sounds like a https://xkcd.com/2501/ moment. Your average internet user probably doesn't know there even is a Linux, and might be able to install mods at a push but not troubleshoot them.
Enthusiast, yeah, trying to get into tech for a job, but don't have the CS degree they all want.
No, but not by choice. Not running Linux because I buggered my UEFI somehow, and so it won't allow me to boot from USB or switch to my Linux partition.
I think it's because early Millennials are near the peak of techiness, and the sort of person to switch to an open-source, decentralised, somewhat anti-commercial website is also the sort of person to use Linux. I'm early Gen Z, but fit the other two categories.
All of Tumblr saw it that way.