this company Spur recently got millions in funding and their pricing seems to be directed at large companies. Who's buying these absolutely non-actionable IP databases? Do corporate buyers not understand you can't just block someone because they share the IP with someone else who downloaded a dodgy app?

I know that SpamHaus is using this dataset as a large (at times sole) contributor to their blocklists. So corporate buyers are doing exactly what you describe, albeit indirectly.

Lack of any IoCs also makes it hard to refute or remedy. Plus I think it paints even Tor relay nodes with the same brush as malicious proxies.

Truly kafkaesque if you start getting restricted and nobody tells you why or even knows what to tell you because the sources have all been mixed and obscured.

Spur's residential proxy data is not intended to be used as a blacklist. We recommend using it as enrichment alongside other signals, not blocking an IP just because it was associated with proxy activity.

More on why here: https://spur.us/blog/i-dont-like-big-gateways-and-i-cannot-l...