Who are the companies renting out GPUs at scale? There is obviously GAFAM (which have their clouds basically), OpenAI and other startups with big contracts for

Who are the companies renting out GPUs at scale? There is obviously GAFAM (which have their clouds basically), OpenAI and other startups with big contracts for said cloud services, but aside from them, which companies actually rent out dozens of GPUs to train their networks? And what do they bring to the table that makes them think they can archive better than OpenAI and GAFAM? Serious question. I think most companies without the top talent would do better using an API product.