the twitter pressure campaign

It could be the threats from their more important clients https://twitter.com/Foone/status/1565026728241614849

Interestingly, that thread gives no indication (other than the date it was written) whether the user is mad at CloudFlare for enacting censorship or for the lack of censorship.

For the same reason thieves go to prison after returning stolen goods.

Unlawful content gets posted to Facebook, Twitter, YouTube, Reddit, etc. all the time. We don't deplatform all of them just because there was a window of time in which it was posted but not yet removed.

Value of Facebook?

The burden of proof is on the interlocutor to disprove the value of a Fortune 500 company, yes.

I guess at 460bn market cap it's a tad more valuable than the drug market https://www.worldometers.info/drugs/

"With estimates of $100 billion to $110 billion for heroin, $110 billion to $130 billion for cocaine, $75 billion for cannabis and $60 billion for synthetic drugs, the probable global figure for the total illicit drug industry would be approximately $360 billion"

Correct. To square the circle, consider that while they're being fined heavily for their involvement in a massive legally-sanctioned opioid epidemic, the major drug companies aren't even being dissolved.

At this scale, for corporations, total value to society is part of the calculus society does. And KF has no value to demonstrate to offset the harm.

Google exists.