If big tech are the issue, then try this robots.txt (yes on github...): https://github.com/ai-robots-txt/ai.robots.txt

My issue is with the scrapers pretending to be something they aren't. Tens of thousands of requests, spread over IPs, mostly from China and Singapore but increasingly from South America.

AmazonBot follows robots.txt. I don't so what Huawei and Azure ASNs have to do with it - that sounds like those requests simply come from inside a Huawei and an Azure network, respectively, but could otherwise be anything.