Anti backpacks/spoof ideas
Removing qcaps will probably remove ~20% of the existing player base to already diminishing numbers.
In order to save the player base and maybe bring back older players while keeping newer, clearly 2 things need to happen. Remove backpacks, remove spoofers. For each, you have to add features that specifically harm them.
Backpacks. Hilariously, the fix is to make the player play the backpacks more. First, you need to detect backpacks. Any account that doesn't remove or add a reso in a full score cycle (upgrading resos/mods do not count) is flagged. Cmon, you have a week. This way the Intel board will show you what account is actually playing. Any account that is flagged has 1 full scoring cycle to remove or add (17 minus thier current level) resos or be set to inactive. Any account inactive for a month gets all their items deleted. The multi account players run out of room caused by their own backpacks. Any account that has recursed is excused from the last item deletion part, except for keys, so recursed inactive mules cannot hoard keys. Inactive accounts cannot play and can only be restored by Niantic. They can flag all the problem accounts
Spoofers is mainly based on keys. And there are way too many keys and whatever baf/blocking links is created, so it's too late. So you have to find spoof accounts and attack the portals they are spoofing. Using the flagging method above, if an account is flagged, it cannot hack for keys. Any portal owned by an inactive account, also cannot be hacked for keys by anyone. After 25 hours plus whatever portion of 5hr mini cycle is left, any field with a link over 10km can be underfielded. So for areas permagriefed, hey, at least you can field, unless they take down and put up their field every other day.