Everyone is applauding this because they hate Trump, but take a step back and see the bigger picture. This could backfire in serious ways, and it plays to Trump's base's narrative that the mainstream media and tech giants are colluding to silence conservatives (and maybe there could even be some truth to that.) I know the Valley is an echo chamber, so obviously no one is going to ever realize this.
It can’t be all perfectly achieved, but to do nothing, as they were before, could be now determined to be a worse case than providing these annotations to flagrant misuse by the highest impact profile that they can’t do away with entirely.
So what?
There’s no law prohibiting these types of businesses from supporting a political candidate. They could plaster a huge “Vote For X” banner at the top of every person’s profile. Don’t like it? Don’t use it.
It’s not like Twitter is tax-exempt which would prohibit it from endorsing candidates like Churches.