I'll add here that Stock Photos/Images aren't necessarily low quality, and paid Stock Photos are something companies compete for sometimes. Maybe the ones in Pexels/Unsplash aren't that high quality, but that's the reputation of these sites, if people post good content here, our reputation can become much better than theirs. (Dunno if that will happen, but there's a potential.)
RE: About Stock Images and Important Information. Please Read First