Unfortunately TOS consist of words and words cannot constrain technical affordances. There has been a black market of scraped discord data for years (it was even sold on the public web at spy.pet). Stuff like this is probably the only way people will wake up to the realities of digital privacy.
Hopefully this will also wake people up to the issues with putting so much information (announcements, support, documentation, etc) behind a closed platform, thus making efforts like this invaluable for the future.