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I agree that cloud providers are a blessing to attackers, but blocking russian, chinese and even generally SEA ip space is still a very effective way of stopping the bottom 70% of all attacks. Sure, they're trying such outdated methods that there is very little chance of them suceeding, but honestly when just banning china reduces sshd logs by 50% you wonder why you didn't do it sooner.

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Are you sure you're blocking 70% of attacks? Or are attackers just starting there, and when they realise their attacks aren't working they go via AWS instead?

I can't imagine many people sufficiently motivated to launch a DDoS attack against you, yet not sufficiently motivated to switch to an attack method that will actually work.

Most attacks are using a shotgun approach. DDOS generally are targeted but even then just badly behaved scrapers or vulnerability scanners can add up to be like a DDOS.

An even quicker way to clean up SSH logs is to listen on a non standard port.

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