This sounds great in principle, but the visa situation seems rather daunting. "Running a business" is specifically forbidden for visa waiver or B1/B2 visa visi

This sounds great in principle, but the visa situation seems rather daunting. "Running a business" is specifically forbidden for visa waiver or B1/B2 visa visitors; besides, I suspect they won't be too happy if you repeatedly "visit" to the extent that >50% of your time is spent in the US. H1-B seems to be a lottery and infeasible if you own the company and are employed by it. I have no idea if we'd qualify for an EB-1, and E1/E2 seem more geared for owners/employees of bigger companies than recently-formed startups. There seems to have been a string of originally European YC-funded companies that successfully moved to the US, yet there are examples where founders are "stranded" in Europe (e.g. Dailybooth). I vaguely remember an article written by one British founder of a YC startup some years back who got in via an E2, but I can't seem to find it. It would be extremely interesting to hear about past experiences with this; I realise it's possible that there's a good reason why everyone keeps quiet about it.