It never ceases to amaze me that Marketplace allows garbage to appear. In my opinion it should be vetted so that anyone relatively new to flight simming can be certain that they are buying something that’s fairly decent.
If nothing else, items for sale should be a quality standard that MS do uphold. After all Marketplace is included in their package and many a newbie will purchase add-on’s thinking it’s going to be an officially sanctioned product. Personally, I buy from official dev websites where possible and resellers such as Just Flight and always research before buying.