I plan to do the same in the near future with an overloaded #Instagram ad in favor of #Pixelfed. It has an unbelievably annoying anti-pattern with a bright notification in the menu and at the #Facebook business settings item. YOU CAN'T TURN THAT OFF EITHER, BUT IT FUCKS MY EYES UP SO MUCH EVERY TIME.
I delete my #Facebook page, so, this counter just moved to "Close friends" option, but I still don't know how to remove this indicator.