AWS is the home of Hackers
I run a small website and in the past few months, the site has had numerous hack attempts (almost a DDOS but not quite) all from IPs 'owned' by AWS.
There are even sites on EC-2 that do nothing more than slurp every page on your site. Amazon is just not interested in stopping them after all, it could affect their revenue stream.
I have filed numerous abuse reports and TBH, some have been fobbed off by AWS.
As a result, I have just blocked ALL of the AWS IP addresses on my firewall.
Amazon in its entirety can go take a hike over the nearest 1000ft cliff.