Because the White House has more power than Will Smith to break up Google.
I'm not attributing to that, but I think the biggest threat Google is being broken up or regulated to death. And considering D control all branches of government, they're the party in power. So I don't think its unfathomable to think that a trillion dollar corporation would want to draw attention away from a small vocal minority of people that isn't happy with the president.
YouTube Rewind 2018: 19 Million dislikes
I don't see any reason you'd attribute removing dislikes to the former rather than the latter.