Then it must've been bad luck. I had plenty more over the course of a few month with a CS GO server and it wasn't the game server because I often couldn't login via SSH or the session just froze. And I definitely took precautions with a firewall, fail2ban and no root, no password only certificate SSH login (a tried and tested combination of measurements I use on plenty other ionos VPS).

You're right the webinterface doesn't really matter but the overall impression was much more professional on ionos with a slick interface for the config of the hw firewall.