If people don't want to post their work for free they don't have to. There's paywall option available, subscriptions, patron style arrangements etc. Just got to find the way that works. Also, when referencing my own photography, I'm pointing out that if I want to make money from it I'd have to put the work in and find the way to do that. Just sharing stuff and hoping to get paid is still a really really new idea and if it's not working then maybe it wasn't that good an idea. The market decides.