As long as it is legitimate and all the legal paper work is done properly, i think it should be fine. Of course, there might be some who register a company just for getting a work authorization and i assume the USCIS will have verifications to make sure you are running a real business and not just a one on paper.
zengr, since you have already moved to H1, i don't think it will be applicable for you. I am also on OPT working for a startup and i am moving to H1 shortly.
As long as it is legitimate and all the legal paper work is done properly, i think it should be fine. Of course, there might be some who register a company just for getting a work authorization and i assume the USCIS will have verifications to make sure you are running a real business and not just a one on paper.
zengr, since you have already moved to H1, i don't think it will be applicable for you. I am also on OPT working for a startup and i am moving to H1 shortly.