Oh, well, when you sign up with these free websites, you don’t even provide your email (with the exception of Fubar). As they don’t require any payment methods and details from you, you can be safe. Also, they don’t ask you to provide your mobile phone number. In any case, there is no chance for you to be blackmailed or scammed. Therefore, you can utilize these options knowing that neither of the private data of yours is disclosed, for you don’t even inform anyone about them.