I am extremely cautious of the sources of UGC I host publicly on my Hetzner machines. In addition to the fact that Germany lacks freedom of speech/publication (thus obligating a German organization like Hetzner to censor content that is legal to publish in most places, but not Germany), I imagine it wouldn't take many legitimate/normal UGC-related issues (e.g. properly-responded-to-by-the-box-customer DMCA takedowns) to make my customer relationship turn negative ROI for them.
I wouldn't, say, run a social media site open to the public on Hetzner, even if I responded to DMCA and other legally-mandated takedowns in single-digit minutes, 24/7/365. I just can't imagine they'd accept the overhead of such a customer.
That said, it's great for hosting big files that CloudFlare's TOS prohibits (video, podcasts, etc), just as long as you're certain nobody at Hetzner's going to get a call over one of your URLs.