also note that all of them claim that their residential proxies are "ethically sourced" (unlikely their competitors, I guess?)
there's no such thing as an ethically sourced residential proxy.
I've been thinking about building an actually-ethical residential proxy system, for censorship-evasion purposes.
The internet in a growing number of countries is censored, but different content categories are censored in each jurisdiction. Many sites and services also block known VPNs (i.e. non-residential IPs), so that doesn't work as a bypass in all cases.
I have trusted friends in other countries, so by mutual agreement we could set up wireguard links for each other to use (subject to agreed terms). It just needs some way to intelligently route traffic depending on which jurisdictions will allow which requests (i.e. "which is the lowest-latency link that will allow this request").
> there's no such thing as an ethically sourced residential proxy.
There is, just like you giving your attention and cpu to watch free ad supported content on the internet. It's the same in apps that give users access for free in return for bandwidth, or free VPNs that allow you to share bandwidth. There's also ISP "residential" proxies where ISPs re-sell some of their address space to proxy providers.
Their are services that allow users to share their bandwidth in return for some cents per GB, a way to passively earn income.
Additionally, there's almost no ethical use for a residential proxy. The purpose is always to deceive, at best you get lightly unethical uses like "avoiding georestrictions on IP distributors like netflix", or "avoiding controls in dictatorships" which is acknowledging that it is used to break the law, but maybe it's the wrong kind of law.
Even these soft reasons to use VPNs and residential proxies are like an alibi for bad actors, is IP 25.14.xx.xx creating a fake account on twitter to spread malware or is he downloading a show that wasn't available before? I guess we'll never know such are the limits of privacy I guess.