eBay isn't a "scam" but you need to understand the risks of buying here.

For a start, eBay warned you in the user agreement that they do not guarantee that items sold here will be truthfully described, safe or even legal. Would you have bought from a shop that stated this??

If  you take the risk and buy something here, and it is not as described, most items are still covered by eBay's own money back guarantee. But eBay makes it  clear that the time limit for claims is 30 days.

You accepted all of this in the user agreement. If you didn't read it, that's not eBay's fault.