Biggest warning flags
1) They (often repeatedly) announce that they are clearing out their messages/videos/ppv's.
They have absolutely zero reasons to do this for ANY reason besides to create an artificial pressure on buyers to purchase content that nobody considered worthy of purchase in the past. They know their content sucks, so they've decided to make it a 'limited time collectable' to inflate the value of their trash hoping your fomo & horniness get you to make a bad decision. The truth is that if the content WERE of value, they'd want to not only keep selling it but advertising it since they would expect it to sell.
2) They constantly send out PPV's and they never have a preview thumbnail.
Major red flag, this tells you they KNOW their content is shit and that if you so much as had a single screenshot to base your purchasing decision on, you'd realize that it's shit/low res/bad lighting/low effort/not your thing/doesn't match the description. This is very deliberate obfuscation so that you make a bad buy.
3) They ask for tips before they've even provided any content , or otherwise tell you that you have to pay a tip before they show you the content you want to purchase. This should be obvious, they know that there are no refunds on tips and they can block you if you say anything to them about it and there is nothing that support will do for you. Even more so, if they are requesting tips and not even stating the amount, so they can rationalize asking for more, more, more.