Too lazy to bother with proper research, but considering how big these companies are, asking your favorite LLM How many people work at Meta and Amazon combined? will yield about 1.5M people (+/- the usual yearly thousands of layofss/new hires).
Precisely this, linux is about choice.
It's not like suddenly most distros would change init systems and make it near impossible to choose... oh, wait...I prefer mutable and see immutable mostly as lazyness but if people wanna use'em go for it, i'm not pushing mutable down their throats.
The blog part: create an .onion or .i2p site. Or create a site elsewhere but always do any related tasks through Tor at the very least (including account creation and email usage).Not so sure about the mailing list part.
Kim Stanley Robinson's Red Mars is pretty hard-scifi.Alastair Reynolds' Revelation Space not so much but very entertaining.Edit: for light reading Stross's Saturns Children is fun.
SP3