Online joining is not necessarily a liar, but depends on its follow-up requirements. If the requirements are reasonable, you can consider joining by legal contract. Of course, you should also properly evaluate each other's reputation. If the lion opens his mouth to make some excessive demands from the beginning and the contract documents are unqualified, it will be seriously considered. Even if you are not a liar, there is no future (money way) to cooperate with such people. Doing business pays attention to mutual benefit and honest experience, so keep your eyes open. If you are not clear about the cooperation, you can not sign it first, and show it to a lawyer who knows the law or consult a lawyer. Be careful when doing business online. There is no need to harm people, and there is no need to prevent people.