Agreed that may be the case but all OpenAI needs to do is release a nice UI for GPT and they've suddenly pushed these SaaS out of the market. Why fund miners over the companies making pickaxes?
However, the companies will probably soon be able to switch out the LLM they are using, so potentially they could use Google’s PaLM, or Facebook’s Llama, or some open source LLM, who knows.
They can also fine-tune the models for just-your-data, so that the responses for you are better than just using a general LLM.