All registrars are expected to take action when domains are used for spamming or other unlawful purposes. It's in the TOS.
I myself report domains used for spamming so they will be disabled (hopefully).
However all registrars are supposed to exercice due diligence before suspending an account ie investigate if the claim is legit.
I second that.
I was referring to:
https://www.dynadot.com/account/forum/f0-customer-feedback/spam-complaints-371.html
So a member gets suspended from the domain owners forum but forum notifications keep getting to the guy that got banned. So he reports this as spam to dynadot and dynadot moves to suspend the domain on this single persons spam complaint......