Most actual math people never have to think about pemdas here because no one would ever write a problem like this. The trick here is “when was the last time I saw an X to mean multiplication” so I would already be off about it

1 + 1/2 in my brain is clearly 1.5, but 1+1÷2 doesn’t even register in my brain properly.

No, but the fediverse doesn’t go down just because one instance is down.

You would need multiple accounts (one per instance), but you could just switch instances if you had that set up