Not a new phenomenon in human nature or on the Internet, by itself. On some wikis (e.g. en.wikipedia.org) there used to be extensive lists of “notorious vandals”, then people realized that this only encouraged them further, now this is more limited, but there still is https://en.wikipedia.org/wiki/Wikipedia:Long-term_abuse

ffs stop feeding trolls and spammers

That is basically OpenID which has been around for a long time. In principle there is nothing stopping fediverse instances from being OpenID providers or allowing login with an OpenID, not sure anyone has done this yet though.

Not so in Austria. Only Haftpflichtversicherung is required which only covers the car owner’s liability.

some of them maybe? surely not all?