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AhrefsBot respects robots.txt. Details are here: https://ahrefs.com/robot

My parents say I am a very good boy too.

If you don't believe the CEO you can always just IP block them. In my experience they respect "User-agent: * Disallow: /".

Blocking the user agent in my WAF is the only thing that actually worked. So, I'm sure you're right and I am just a random outlying case.