Usually there is no deeper reason than the fact that those private companies are staffed at the administrative and policy level by college-educated yuppies living in San Francisco and New York City, and that demographic has become increasingly ideological in the last few years and bought into the idea that progressive toxicity is either a socially good form of tough love/bullying/peer pressure or at least that restricting it disproportionately damages vulnerable groups, etc while what is labeled regressive toxicity is assumed to be heinous, destroying society, and deserving of quick permanent bans.

Companies are not perfectly rational calculators that always know best how to make money. They are made up of people, and people are flawed. People can be deluded into thinking that their bias toward pet issues is profit-neutral or even profit-positive. It happens in the non-politicized corporate sphere all the time - boondoggles is the term.