They are all going to have some form of automated protection against malicious activity, but I suspect AWS and Google’s algorithms are better than the others. My experience with AWS and Google in general is that your treatment varies with your support plan. With business or enterprise level, you have dedicated resources within the company that are going to be aware of such issues or can escalate and sort it out quickly. I understand not wanting to shell out the base cost for enterprise if you are a small company on a budget, but paying at least for business support is a good idea if you are actually running a business. I have never actually heard of this happening to such a customer though, so perhaps they have extra processes in place?

I've only had one instance where Linode contacted me about suspicious activity. I responded promptly, it was obvious they understood my answer, and nothing came of it. Another comment thread on this story has people saying Linode's support is better.