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It should be noted, however, that almost no one reads end-user license agreements and many of Discord’s users are children and teenagers. Discord is, first and foremost, a platform for gamers to organize communities and it’s not plausible that a 15 year old looking for a Fortnite meme server ever thought their dumb jokes about Tomato Town would end up in a public database five years later.
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Same as other commenters here: I think this is shameful action under the guise of research and I cannot fathom why any IRB board would approve this (and perhaps it did not in this case, I do not know if Brazil has such a thing).
Back in the day (15ish years ago), I wrote a paper where I scraped the World of Warcraft API. It wasn't hard to do, I started on a realm, looked for arena teams, then went to guilds and got character sheets from there. I took the opinion that if Blizzard doesn't throttle me it's fair game.
Looking back now, I think that to have been pretty naive. I wouldn't say reckless, but definitely naive. In my mind, I had not made a delineation between "I can access this thing manually one at a time" and "I can access all of it automatically". As far as I was concerned, it was just the computer pressing the buttons. It was the same thing.
I think in the fullness of time we have collectively come to realize it is 100% not the same thing. The _availability_ of a thing and the _collection_ of a thing are two different issues with their own thorny problems. The researchers here have made the same mistake I did, but instead of it just being what gear your character was wearing, they took actual communications instead.
I hope this paper gets retracted, all data deleted and a sincere apology offered.