These are great questions to ask any company, not just AI/ML companies. Also, if you're planning to do it:
4) What is the companies policy on employees moonlighting / doing side contract work for other companies not related to it's business?
Inquire about this before you get your offer. Ask me how I know...
EDIT: Another one, which is kind of risky but I personally think is important and would ask any small company:
5) How transparent/open are you about the company's financial health? Are the books open or semi-open?
Keeping in mind that some companies will not share this information and may even find the question offensive. One time I asked the owner/founder this, and he would not share--I found out later through a side channel that he was very offended that I asked for this information (but hired me anyway because he needed someone like me).
4) What is the companies policy on employees moonlighting / doing side contract work for other companies not related to it's business?
Inquire about this before you get your offer. Ask me how I know...
EDIT: Another one, which is kind of risky but I personally think is important and would ask any small company:
5) How transparent/open are you about the company's financial health? Are the books open or semi-open?
Keeping in mind that some companies will not share this information and may even find the question offensive. One time I asked the owner/founder this, and he would not share--I found out later through a side channel that he was very offended that I asked for this information (but hired me anyway because he needed someone like me).