If you’re not a ‘photographer’ you might not see the big deal with Instagram - although it should upset u that people use your images without permission. Who knows what they will choose to advertise with them. Chick-fil-A, would that piss you off?
But for those of us who actually show our work, occasionally make a sale, and consider our images art, it’s incredibly upsetting. I will find another place to show my work.