People are randomly having their accounts follow the WH and even re-following if they decline.
https://www.thegatewaypundit.com/2021/01/instagram-forcing-users-follow-biden-white-house-account-not-pathetic-even-users-repeatedly-un-follow-page/

Instagram adding followers, Youtube adding likes, removing dislikes, votes "accidently" being added to Biden. To quote Ian Fleming “Once is happenstance. Twice is coincidence. Three times is enemy action”