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Quantenna used 1.1.1.1 for RPC to their wifi chip in their SDK by default. Should not have been exposed to global routing but of course people screwed that up.

https://medium.com/@mrtcve/atts-misuse-of-cloudflare-dns-ip-...

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My ISP won't give me the router credentials because they claim that that would somehow risk their network interconnectivity or something. I have no idea how this makes any sense since a router (shouldn't) give me that level of access, but maybe I'm missing something?
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If the router is also the modem, it can have diagnostic stuff that could (I am careful to point out: theoretically) cause them a big support headache in one way or another.

Also, I had a DSL modem back in the day with its own terrible NAT built-in. I managed to log in (I may have been given the admin password from a friend who worked at the ISP, allegedly) and once I put it into bridge mode, I was able to acquire multiple public IPv4 addresses via DHCP.

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Or they didn't want you to know the IP(s) so you could easily block it

Sounds like they blocked Cloudflare but couldn't block Google

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