I’m not accusing any one engine discussed in this thread, but hearing a proxy vender like decodo providing search give me a feeling there’s non zero over lap to bad search and residential proxy crawler.
I build a web-fetch tool for my own LLMs that is essentially the same tech as web-scraping except its single requests not high volume.
You can't really get anywhere these days without disguising UA etc.
Anyway I’m not expecting a solution. Just say this sux.