It's just a computer. You can do whatever you need a computer for. Browse Lemmy on it. Play video games on it. Use it as a server. Make it run an ad video on the TV in your store window.
Whatever you need a PC for. If you don't need a PC for something, you don't need a Raspberry Pi.
The entire point of the Raspberry Pi was that it was a very very cheap PC, and it's no longer cheap, so nowadays there is definitely less reason to buy one.