To follow that idea to it’s logical end, first, you’d have to not use the internet at all.
Or read anything printed, since printing also makes porn available.
Or shop at any store that might sell books or magazines that could be porn or at least soft porn.
Or at any drug store that sells KY jelly, lest someone somewhere is using it to masturbate or in the making of a porn movie.
Or attend a school because sometimes at school kids pass porn mags to one another.
We cannot police the entire earth, or accept responsibility for the choices (good or ill) of other people.
We CAN make good choices for ourselves. And that might include staying away from certain internet sites if we are likely to be tempted, to use safe search etc options on the net. To not visit porn sites or porn stores. etc.
Most porn is money driven. If we don’t do anything to make porn more lucrative to the makers, then we are not supporting it. If we find a site we frequent to have ads for porn, then by visiting the site we are registering hits which encourages more porn sites to advertise there. So, if you notice ads for porn on sites you frequent. I do think it’s good to stop going to those sites.
I was shocked when a few months ago I started seeing ads for soft porn on a site with inspirational quotes… HUH? they don’t get my “hits” anymore.