I'd argue it's actually risky to build an AI startup now. Most any feature you bring to the table will be old news when the AI manufacturers add that to their platform.
You just need to focus niche and upmarket, OpenAI is e.g. never going to make that "clone your chats and have your LLM-self go on pre-dates" app that went around Twitter.
Yeah but that kind of stuff doesn't generate income, they're just cute programming toys.