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Sadly, the more common practice seems to be adding the entire IP blocks of known server/cloud providers to blacklists.

Definitely true in my experience, which is funny because it renders the whole point of the RBL entirely moot. It’s certainly not a sustainable solution.

It's comparable to using an RBL that excludes dynamic IP clients. The difference is one of culpability IMO, where the dynamic IP clients are likely to be innocents with compromised boxes but these cloud instance spammers are actively hostile (insofar as spammers are hostile)

I think I experienced this.

Received an email from campus IT that my phone was compromised.

On further digging I would load up a game every once in a while on the campus wireless. That game used a popular/legit Chinese CDN to host something on their news page which was flagged.

Easier to just use my wireless phone package instead of explaining my phone wasn't compromised.

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