See attached image.
Unpurchased resource packs, both those by third parties from the Marketplace and by Mojang, appear in the global resources list. The problem with this is that as more and more resource packs continue to be added to the Marketplace, this list will become incredibly long and will probably be laggy.
I understand that perhaps this may not be seen as a bug, but leaving the functionality this way will cause many problems as the Marketplace continues to become populated with content.
A search was performed for this issue using the keywords "unpurchased resource packs," and no relevant issues were found.
*Thank you for your report!
However, this issue has been closed as a Working as Intended.