If i recall correctly, Patreon has a measurement for that. Basically the Creator is reported as Down/Inactive, then the page is shut and the money refunded.
Maybe I'm wrong, haven't see about that in a long time
From what I heard from JD's situation they couldn't do that and were refunding the Patreons who supported the wrong one themselves. Was causing a lot of confusion as the Patreons who supported the old one were not getting the game as Boomatic had sole access to it, and as such the team actually making the game couldn't distribute the game to the patreons through it. On top of the fact that they could not get funded for their work through the original.
Anyway I'm going off of memory and a reencountering of what happened. If you would like to know what happened try asking JD they are active both on the form of their game Sweet affection and their discord although more so the second, but I remember for a fact that they were having issues as they could not close the page, or even have payments suspended. Also they did refund people there months subscription if they were charged twice from having used the original.
But either way that would still take someone to report it. If not reported where those all the money go, and with the games like this where there is nether a patreon post nor any activity from the dev anywhere in so long why are they still receiving money?
Not saying necessarily you are wrong as there may be measurement for that as you said. More so questioning whether such measurement are actually utilized when it comes down to it.