All the other points stand, and the platform is indeed full of spam and scam - because many "servers" are run and inhabited by kids who don't investigate any of the moderation options and/or actively participate in the spamming themselves - but it certainly doesn't mean it can't be done.
(IRC was full of spam and scam as well as soon as you stepped away from the better kept communities; and also things like DOS wars and hostile channel takeovers during network splits, which Discord seems so far largely free of)