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.
Are you shopping at the Dollar General?
Last time I was at a Walmart/Target/Publix/Ingles/etc all that shit watery beer is still there plus the largest selection of ales lagers and IPAs that there has ever been. Not to mention the ciders and seltzer that are huge now too.
Just wanted to chime in that I wholly disagree with this “beer was better back then” bullshit.