Are you sure you're not mixing up companies training their own frontier-ish models with companies providing hosted LLM API? For a close comparison, VPS hosting provider market did not collapse to a small number of players - few companies dominate the market (AWS, GCP), but there are thousands (or tens of thousands) of medium and small players available.
Are you sure you're not mixing up companies training their own frontier-ish models with companies providing hosted LLM API? For a close comparison, VPS hosting provider market did not collapse to a small number of players - few companies dominate the market (AWS, GCP), but there are thousands (or tens of thousands) of medium and small players available.