this post was submitted on 19 Oct 2023
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Piracy: ꜱᴀɪʟ ᴛʜᴇ ʜɪɢʜ ꜱᴇᴀꜱ
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The DNS modification is slightly off. Some ISPs check UDP packets since they are insecure and will modify query results regardless of the DNS server you are sending to. Mediacom is known to do this for their billing and DMCA systems. They use DNS redirection to assist in MITMing the connection to load their own certificate to your browser. With that done, they can prepend their own Javascript to the response they receive from whatever web server you are trying to contact. That's how they get their data usage and DMCA popups loaded when you load up whatever site.
ISP mitm sounds infuriating
Even if it is not being done for a malicious reason, it is still a malicious practice. Websites can help prevent this by adopting wildcard Subject Alternate Names in their certificates thereby making the redirection much less likely to succeed, but you shouldn't have to view your own ISP as a threat actor.