They do have some perplexing rejection resasons, and I think now (2016) they and envato are the only regular culprits in arbitrarily accepting all or almost none of a batch that I upload (usually all or most images accepted, but randomly most or all in a batch are rejected). It's the...
a value-oriented stock media offering; Shutterstock Custom, a custom content creation platform; Offset, a high-end image collection; PremiumBeat a curated royalty-free music library; and also Rex Features, a source of editorial images.
FreeImages.co.ukis another great site to borrow free photos from. On this site you’re free to choose and download any image you want, but the terms of use ask you to put credit wherever you use the picture. All the images are provided unwatermarked, free of charge for both commercial...