Cash plus vs Money Markets is Vanguard being greedy?

I just saw an add for a “boosted APY” for Cash plus with a rate of “3.35%”. . .but their Money markets are getting 3.66% without a “boost” I get the difference between FDIC and SIPC but if the VG money markets break the buck in my opinion that means something catastrophic has happened and FDIC is probably in jeopardy as well. . . Is VG just being greedy pushing the Cash plus product which is more valuable to them instead of their best in class higher paying money markets?