[ceejayoz]

Sure, why not? An automated form reply stating "Your account was blocked for the following spam posts" with a way to appeal false positives.

You might even require a $5 bond to appeal or something, to prevent spurious appeals.

[dublinben]

This just teaches the abusive users which behavior was caught, so they can learn to be better at evading that scrutiny in the future. It is completely counterproductive for a company to provided banned users with a detailed reason for their ban.

[ceejayoz]

Spammers have plenty of ability to A/B test these things to determine which posts trigger and which don't.

Meanwhile, normal users are left totally confused, with zero recourse and potentially a loss of important data and other significant repercussions.