Just stop scraping. I'll do everything to block you.
Seems like they're only scraping websites their clients specifically ask them to
There's no point in playing tug of war against unethical actors, just ban them and be done with it.
I don't think it's an uncommon opinion to behave this way either, nor are the crawlers users I want to help in any capacity either.
Then again why block them if they don't cause any issue in the first place? Instead of going ballistic on IPs that you don't vibe with you could also just do proper rate limiting.