A reader, Vera, left a comment pointing out that for the Glade Plugins Car Kit deal MyPoints rebate offer, it can only be done once. I went back to look at the informational and sure enough, in plain sight:
Points for this offer can only be earned once.
When I went back into MyPoints account, I noticed that my status had been updated to “rejected”. I still got the SwagBucks rebate so I am done with the deal.