Earlier quoted context omitted.
They are great for throwaway hobbyist side projects where you don't want to worry about AWS billing horror stories or more expensive offerings like Digital Ocean or Linode. I would not recommend them for a serious, money-on-the-table business.
I only use them for money-making projetcs. Based on my own experience and what I read online, you need to be careful with: * crypto mining (I used it when it wasn't causing much trouble but I noticed my nodes were constantly attacked at a ratio I newer saw for other servers); IIRC Hetzner's current ToS forbid crypto mining * things in legally grey area which might be legal in some places but not so in others, especia…
So beware of their ToS.