I don't know about YouTube, but I've read that the 2017 transition and the 2021 transitions were different on Twitter:
2017: Obama's institutional twitter accounts (e.g. @POTUS) were archived, but Trump inherited the followers in his new @POTUS account.
2021: Trump's @POTUS was archived, but Biden's new @POTUS didn't inherit Trump's (and Obama's) followers. He had to start from scratch.
https://www.nytimes.com/2021/01/19/technology/biden-white-ho...
Presumably you could unsubscribe. Which is not the case with instagram. If you followed the White House account, or you decide to follow the archived account for Trump, you are periodically made to follow the current White House account for Biden. Even if you block the user, it will unblock and re-follow you.
I'd be surprised if it hadn't. The bigger question is whether YouTube manipulated the dislikes back then, too.