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They stopped.
I figured they got the message I didn't want their crap.
In my case, the mail spam for the CreditOne "Platinum" stopped as soon my credit scores went above 700 - or it could be the entrance of another entry (the one from CHASE) as account was seen.
Over time they will cease sending the crap. As they see that you are no longer a beginner so no longer their advertised peer group.
I've received offers from them from time to time through the years, and I have never been in their target demographic for the 15 years or so they've been operating under their current name and business model. I've even had "guaranteed $300 approval" fee harvester mailers from them while having scores in the 800s. I wouldn't take it personally; their marketing arm just isn't hitting the right targets all the time.