This is way more than the few cases that float up into your attention. It's been going on for years across all these big silos. People who fully endorse actual censorship know they can abuse automated systems to silence marginalized people.
Very true. This statement is neutral with regards to both the left-right axis and authoritarian/anti-authoritarian axis. In order to have a society in which people can speak truth to power, in 2019, we have to be on the lookout for new forms that censorious power can take.
Technology is a double edged sword here. New tech introduces ways of circumventing censorship, but also introduces new forms of censorship not covered by old laws.
You won't get large companies to officially make value calls and say "no, it's okay if this user says that because they are part of a special group", they will be too vulnerable to public/media/political pressure, especially in a culture that is generally pro free speech.
Might be something newer, of course, in which case I didn't see it and can't comment on it.