Of course, if ASMR is just about getting tingles, then even without its being eroticized, it certainly can be considered porn-like. Following the Supreme Court's famous definition of porn as "I know it when I see it," ASMR can look NSFW. It's already the case that many of the most popular SFW ASMRtists happen to be young, good-looking women, and there's certainly something porny about watching internet videos by yourself to achieve an orgasm, of the brain or any other variety.
There are a few obvious distinctions between whisper porn and regular old porn: ASMR doesn't cause sexual arousal (though there must be at least a few outliers who use it for that, because the internet is vast and people will get off on just about anything). Watching pornography regularly is correlated with elevated levels of depression, whereas many report ASMR to help with depression, anxiety, or insomnia. GentleWhispering, the doyen of the ASMR community, says, "We've gotten feedback from firefighters, soldiers, pilots, lawyers, single mothers, and suicidal teenagers who just watched these videos and it changed their attitude and mood for just a few minutes."