For comparison, "Google Plus had 10 million users two weeks after its launch on June 28, 2011."
https://www.washingtonpost.com/technology/2023/07/06/threads...
YouTube constantly harassed you to convert your account to be a Google+ account, and there was a point where commenting on any YouTube video would automatically make a post on Google+, as if you shared the video with that comment as a caption. They're totally not comparable.