Because for months people kept saying that Etsy needed to weed out the spam messages since (mainly new) shops weren't savvy enough to recognize they were spam and no one wanted to listen that Etsy isn't good with programming for things like this and it would just create bigger problems. So true to Etsy fashion, they implemented a new system, didn't give people any head's up (at least I haven't seen any notice of them admitting they were starting this process) that they would be starting to automatically move some messages into spam and to check that folder while they worked out any kinks, and instead just let the poor programming fly.
