Not if you know and ask the right questions and ask for additional info before purchase.
If you must purchased used devices from unknown sources, you must ask A WHOLE LOT more questions of the iOS device seller, ask for more photo/images, ask if the iPad has user/iCloud activation lock and ask for photos/images/short video proof, ANY REAL, UNQUESTIONABLE PHYSICAL/ VISUAL PROOF, that such an iPad has been reset to factory settings and shown proof of the iOS device's start up screen showing the animated, moving, multi-language “Hello” Welcome to iPad screen.
If the iOS device seller is unwilling to do all of this to show you that the iPad, in question, is ready to use with no barriers to new user activation and use, pass on the iOS device and look at other iOS device sellers, elsewhere, who will be more accommodating to answering questions and providing visual image or video proof of a proper factory reset iPad.
I purchased my recent, older 12.9 inch screen iPad Pro from a single iPad owner/user, eBay seller and, after asking a lot of pointed questions and for images of the screen showing the animated “Welcome” screen in multi-languages, the seller was very accommodating and supplied my with everything I ask for and then some and that seller made a sale from me.
This iPad was like new and was reset properly for sale and the seller did a very excellent job of packing this iPad for shipping.
I was really impressed by how well this iPad was packed and shipped when I received it!
It's all about being a diligent and knowledgeable consumer/customer.
