Malicious instances would need to be blocked by the instance you are registered to.

As for multiple accounts - couldn’t the same thing be done on reddit? Just make a bunch of alts and self-inflate your own posts/comments.

These issues are as old as the internet and can only be mitigated, not prevented.

I’m not saying you’re wrong - I don’t know the truth. But your source is literally: “Trust me, bro.”

I’m already more active in 2 days of Lemmy than I was in 5 years on Reddit. Loving this community.

Just deleted my 5yo account. But it wasn’t that hard since I mostly lurked.