OK, so he fucked a 22 year old fan he didn't talk to for 4 years after first contacting he said happy birthday 4 years ago? That's not "cancel-worthy", but Dan's been whispered about for years now. He basically just fucks his fans and then ghosts them right after he's done with them. He probably acts like they matter and are important to him, when really he's just after pussy, and then he drops them cold. They get confronted by the fact that they aren't special, they never mattered to him, that they just got played.
Is this something people should care about? I'm honestly asking, because it's an interesting subject. He didn't assault anyone, or have sex with someone that was underage or even send lewd things to anyone below 22 that we know of. But what he's doing is probably emotionally devastating to a lot of people. The pain is real, it's morally fucked up to just ghost someone after sex when you acted like you cared about them as a person. But he didn't violate anyone's consent or break any laws, he's just a shitty person.