It's doable for a very useful definition of "do". A good comparison is "the pirate bay" and copyright infringement. You can't shut down all copyright infringe

It's doable for a very useful definition of "do". A good comparison is "the pirate bay" and copyright infringement. You can't shut down all copyright infringement, but starting a company in 2018 to spread and share other people's copyright is not "a good idea", or at least you know what you'll be getting into. GDPR, likewise, is meant to stop dealing in other people's PII without consent (and consent can be withdrawn). When you see "PII", think copyrighted content. You can't say "because algorithms I'm not responsible!".