One obvious reason is you just need to be where people are. That's what presidential candidates do. It seems like Biden is throwing stuff at the wall to see what sticks. The internet is so much weirder and more fractured than it was in 2020. It is so much harder to not only attract attention, but to dictate and program media cycles.
On one level, Biden is trying to do fan service for people who really enjoy the 'Dark Brandon' memes. He seems to be doing some light trolling of Trump. And then there seems to be a little bit of behind-the-scenes content for voters to get to know him.
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