What does being veto-proof have to do with it? No president has to sign a bill just because Congress can override him if he doesn't. His signature is literally an endorsement.
Yes, but we're not arguing about whether Biden agreed with the bill, but that turning it off was a stunt on TikTok's part.
Someone said there was an executive order, but there was not. He said he wouldn't enforce it, obviously signaling that it's up to the incoming administration.
The fact that TikTok turned off for only 12 hours makes it pretty obvious they wanted to have a good relationship with Trump by giving him some positive PR. Which is ironic considering banning it was primarily pushed by Trump to begin with, but people have obviously forgotten that.
And to prove how much of a stunt this was from TikTok, they turned their services back on less than 24 hours later even though nothing had changed.