That someone wants to use a robot to completely scrape an entire dynamic website is their goal. A site is not responsible to make that possible. One bot causes _way_ more traffic and CPU usage than just a normal visitor or 1000s of visitors.
Saying '2017' or anything else: meh.
Various network operators are pretty helpful. Sending abuse complaints regarding misbehaving bots has resulted in actions before. I've seen action being taken from universities, ISPs, etc. Though normally the bots are auto-blocked (on IP address or ranges; quite easy to script).
robots.txt is an established / de facto standard. Ignore it, be prepared to explain why. IMO pretty much any country have computer hacking laws which are vague enough that to consciously ignore such a standard can be seen as "invading".
A "not my problem" approach: I think you should really think a little bit more.