This happened to my instagram yesterday night while I was asleep. I don't have a particularly high value username (it's probably worth somewhere in between $300-500), but still incredibly frustrating to deal with. True to the article, I had already enabled 2FA last night and it didn't matter.
Thankfully, IG gave me the option of restoring my username when I logged back into my account today.
Thankfully, IG gave me the option of restoring my username when I logged back into my account today.