The law in Canada limits the ISP's risk exposure and the pursuable damages of the rightsholder. Also it definitely would cost them if they told me "we have not responded to this notice from the rightsholder" and then turned around and did exactly that. That would be a flat out lie to their client. I'd have grounds to sue in a situation like that.
Also, I've been doing this for almost a decade and never had any problems. Maybe you shouldn't assume that your situation is everyone's situation.
That level of paranoia is a waste of energy. I know that what I'm doing works just fine. Why would some Hollywood studio plant CSAM in a torrent? That would implicate them as well. It makes zero sense. They have better things to do than entrap some nobody in a country whose laws don't favour them seeking any damages. It would cost them far more in legal fees to come after me than to just leave it alone. The notices they send out are entirely automated and exist primarily as a scare tactic.
If you're willing to be curious and open minded about things beyond your limited perception and experience, rather than be a know-it-all, I'd be happy to share with you an example email that I recieved recently. I think the language they use is quite interesting.