It doesn't really matter if 1P is dominant across the whole market. It matters a lot if it's dominant across the part of the market that's willing to pay actual cash money for password management.
How did that work out for DropBox? Google and/or Microsoft could announce tomorrow that they are either giving the same functionality away or bundling with their Office product.
That’s originally what I said, if you define “success” as the original investors being able to pawn a money losing company off on the public market, it could be successful.
But if you define success as a company that can actually turn a profit consistently, Dropbox is not a success.