I know of multiple businesses in Europe that have been doing that for a while with 70B models, and are upgrading hardware to run the new crop of 700B-1T models (really started around Kimi K2, but buying and hosting that kind of hardware takes time)
Not everyone is willing (or even legally able) to send their trade secrets to OpenAI or Anthropic
Not everyone is willing (or even legally able) to send their trade secrets to OpenAI or Anthropic