Huh, I took it more as

Trump broke platform rules -> Trump punished with restrictions

Other politicians didn’t break rules -> no restrictions

… Fear of public perception and loss of advertising revenue …

Trump restrictions lifted -> now it’s “fair” for Trump to do whatever he likes on Facebook and be treated the same as politicians who don’t break platform rules

It only makes sense when optimizing for ad revenue and there we go, I just answered my own question. Let’s not pretend this is about actual fairness or objectivity on Facebook’s part.