H1B抽中以后办绿卡的风险？

l1 和 h1b 不会因为有移民倾向拒签， 因为 l1 和 h1b支持dual intent，USCIS规定可以有移民倾向，不要杞人忧天。
官方规定的dual intent:
Persons with H-1B visas (for specialty workers and their spouses and minor children with H-4 visas), K visas (for fiancees or foreign spouses of US citizens and their minor children), L visas (for corporate transferees & their spouses and minor children), and V visas (spouses and minor children of lawful permanent residents) are permitted to have dual intent under the Immigration and Nationality Act.

以下类型属于边缘地带，基本也不会因移民倾向被拒：
Federal regulations also appear to recognize dual intent O visas (for workers who have extraordinary ability and their spouses and minor children), P visas (for athletes, artists or entertainers and their spouses and minor children), and E visas (for treaty traders or treaty investors and their spouses and minor children).[2]

以下有移民倾向会被拒：
Most other foreign visitors and workers, like those on H-2B worker, H-3 trainee/worker, B-1 business, B-2 tourist, Visa Waiver Program visitor, F-1 student, J-1 exchange visitor, M-1 student, journalism, and entertainer visas should not have immigrant intent, as discussed above. Such visa holders can be denied admission if the consular or port official reasonably believes that they have interest in permanently remaining in the United States (i.e., in pursuing a green card).