I will add another one: they have a bigger fish to fry.

Starting SaaS businesses and allocating time and resources for each, plus marketing, legal..etc for few million dollars AAR is not worth it. Anthropic lost 80B in 6 months, while OpenAI lost 21B [1]. So even if they hit a jackpot for a SaaS unicorn it won't be enough for the markets and investors. They need to be the SOTA and enable every enterprise out there to use their products.

[1]: https://www.neura.market/news/openai-q2-losses-widen-anthrop...