It's normal to have fears especially when a website only has one payment option, it's Normal to panic because we all want to see different payment options that we can easily use to withdraw our money. But one thing you should know is that cryptocurrency is not new in fact it's even more secure and more safe to receive payment through cryptocurrency preferable bitcoin, that way you can apps like luno to receive your payment and sell to exchanger which can easily be transferred to your bank. As long as the site is paying and your withdrawal Wes processed successfully to your bitcoin wallet you need not to be afraid, it shows they are legit, but if not and your payment is only just processing and no payment received then you have every right to doubt the authenticity of such site and report them.