I'm very doubtful as my own experience would lean strongly against it having worked at multiple similar companies (facebook, tiktok, snapchat) and having even worked on recommendation system area. Internally the typical employee tends to be liberal/libertarian and for facebook I remember conservative employees being so rare there was one person doing meetups with anyone interested to talk to an open conservative in the company. For tiktok I worked on the main team in the US about recommendation engine for videos and content like BLM was very supported and pretty frequently would appear as a hashtag in trending page.

I haven't worked at google specifically, but having heard plenty of people complain about tiktok/facebook recommendations with very incorrect guesses on what the system bias is, I'm doubtful google is biased against that type of content. Snapchat isn't known as much for recommendation so haven't heard much feedback on it's system.