In nearly 1,000 nights staying in a Marriott Property since 2019, I’ve only met ONE Cobalt (happened to be sitting at the table next to him at the Hotel Paso del Norte and he overheard I was Ambassador status).
The guy spent ~$130k/yr with Marriott and owned a company. He mentioned he had to review a certain number of properties where he stayed to maintain the status and he was recommended by the management of a property he loved in Florida (you have to be nominated). I believe he stated it was around a 6 month process from the time the property started to advocate for him.
My boss is the only Lifetime Ambassador status I’ve ever met (or heard of) and his wife jokes that he “could take a dump in the lobby” and they would thank him for it.
With the increased spend threshold of $23k/yr it will be a challenge for me as a lone traveler to maintain it (even though I blow past the 100 night qualifier easily 50-75% through the year).