Basically the answer is "no". If they're not willing to help with visas, there is no legal way for someone who isnt a citizen or GC holder to stay in the states for 3 months and work.

As others have said, there aren't any clear cut answers. Disclaimer: I'm not a lawyer, and you should ask a lawyer to be sure. At any rate, a few suggestions (assuming you're EU):

- You could enter on an ESTA, which gives you 90 days. If you leave the US (Can+Mex doesn't count) and come back, the counter re-sets. Note that you're not allowed to work on ESTA, which means that drawing a salary is a no no. But if you desperately wanted to, you could probably figure out how to get paid in your home country or whatever would work for you.

- E-2 visa. A lot of EU countries have a treaty with US which says that: if a company is A) majority (>50%) owned by people/groups from your home country and B) someone from the country (doesn't have to be you) has invested ~$50K-250K (equity, not debt) in the company, then the company can apply for an E-2 visa for their key employees. It takes 1-3 months to process from what I hear, and the investment is substantial, but it's at least one more route that is available.

If anyone has more info on the two above, please feel free to correct me - I feel like I learn new things about the E-2 every time I speak to a new lawyer.

Approach 1 doesn't seem legal and I'm not sure if Yellow Incubator would agree to it.

Approach 2 doesn't make sense. It seems to be more work (time and money) than the likely benefit from joining this incubator.

Approach 1 doesn't give you a work permit. It's merely an explanation of how you can spend 90 days in the US as a EU citizen. But I don't think Yellow Incubator would dive that deep to see if you have the proper immigration papers.

Approach 2 makes sense for some. If you're just setting up a company to be in this incubator, then I 100% agree with you. But if you're working on something, and you think it'll have a better chance at succeeding if you're in the US, then it might very well make sense for you to get that kind of a visa. Many people (not involved with this incubator) do : )

Getting work visas can take considerable effort and the biggest resource is the sponsoring company that you are going to work for, so in the absence of such help it's unlikely that this is worth it. Also the terms about assigning all IP over to them doesn't help either.

Looks like for all practical purpose you have to be an US resident.

A visitor visa typically disallows you from working, so I'd imagine not.

Do you already have a Visa? If no, you can't apply.

Even if you do most are tied to employer..so that's a no-go as well.