Path is one of the worst ISPs. They're a DDoS mitigation system.
They don't have Cogent as a direct upstream. To be clear, that blue box of Tier 1 ISPs will always contain Cogent. Pay attention to the arrows. Path's upstream are Arelion, GTT, PCCW. Cogent doesn't have a direct relationship to Path. You can still try them (I would), but don't be surprised if it's ineffective.
Path's CTO is/was Corey Barnhill, a pedophile sadist. If you're going to be careful sending complaints to anyone, Path is the only one to watch out for because they will probably try to revenge dox anyone complaining to them they suspect is from Kiwi Farms.
Arelion is a solid ISP. GTT has censored before. I have no experience with PCCW. If you're going to complain, those two are your best bets, and Cogent is always worth it.
Don't forget the domain. Who's the registrar? Who's the NIC? Are they using a fun novelty domain? That NIC is probably Identity Digital, then. ID is weak with big AUP it wants to enforce.
Who's running the name servers? Is it a big company that has its own AUP? If it's a small self-hosted DNS provider, who's the nameserver's ISP? Are they on Cogent?
The names to look out for as weak points are here:
Liz Fong-Jones taught me most of this btw.