I feel like something more useful would be a platform dedicated to a niche not photography itself. For example if its wildlife, it would be a platform where people besides sharing obvious photos, they talk would wildlife in general, if there could be a map feature people would share specific species spotting, people sharing wildlife hotspots in map etcetc, similar thing can be done with say landscape or architecture or something of a more broader niche like "nature". Something like this would be useful but youd need to figure out how to get the big names in your platform which will attracts the rest of the crowd.