They already are, or did you ever consent to cookies here? At least I don't remember doing so.
As they are a US company only they don't really need to care though for now. Yes, the EU claims the law to be extra-territorial. There's no instance yet where the enforceability in the US has been tested though, and it's highly unlikely a small and hardly profitable enterprise like Steemit Inc. will be the first one they try with.
Cookie consent prompts are presented to users with IP's in EU
Thanks for that info, I wasn't aware. Maybe better to care before you become the example case :D
Good to see that you're fully compliant then.