I agree with you, but as to your addendum:

Niche hobbyist forums are still safe, for now. There's just not enough commercial interest in petroleum lantern restoration to make it worth anyone's time to poison this particular well.

Even some larger niche hobbies like the saltwater aquarium community seemspretty safe for now (though it also helps that many forums have members who visit each other to trade corals and admire each others tanks).