is there any Legal methods ?
Its not illegal, per se, its just absolutely 100 percent over the top condemed by PayPal's Terms of Service. You will never go to jail for this, but they will lock the bejeezus out of your account, and freeze your funds for 30-270 days. Seriously. Even if you dont get caught, you have no recourse if you get a chargeback. Paypal automatically loses chargebacks against credit card companies, per arrangement (this is why they freak out when you chargeback against one of their transactions), so they will get the money from somewhere, to not incur a loss. You will lose your bitcoin, owe them money, and have your account locked.
Paypal is the goddamned Devil, I've said this many times before. Dont play with them, you will get burned, eventually.