Comment by xena
I'm seeing more big botnets hosted on Alibaba Cloud, Huawei Cloud, and one on Tencent Cloud that run Headless Chrome. IP space blocks have been the solution there. I currently have a thread open with Tencent Cloud abuse where they've been begging me to not block them by default.
I don't consider cloud IP blocks a solution. We use Amazon WorkSpaces, and many sites often block or restrict access just because our IPs appear to be from Amazon. There are also a good number of legitimate VPN users that are on cloud IPs.