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@jup what percentage of pictures would you say use sticky? just watching a game it seems like every pitcher does this (or some form of it).
So when it comes to "stickey", it is probably easier to talk about who doesn't versus who does.
Little hard to say at any snap shot in time, but you are talking 75% to 80% at least I would say, and it is getting worse with each passing year.
Talking about the Cleveland staff a few years back. Of Clevinger, Kluber, Carrasco, Salazar, Bauer, Tomlin, Plutko. Only 2 didn't use it at the time. A year later only 1. In the pen, too many names to cover, but the starting rotation gives you the time frame - all used it in one form or another. And I would say that is pretty typical around the league
There are several reasons it will only get worse. One of the main drivers is the knowledge of the advantage it is. Before pitchers might think it was an advantage because they could grip the ball better or it seemed like hitters had more trouble hitting it or ... But now it is documented, quantified, and publicized. And with the ability to measure the spin effects, comes the ability to train them. So a quick little example should suffice.
There are showcases for HS aged kids. Perfect Game probably the biggest and most well know. When one of my kids is going to one of those showcases, I let them know right up front that they will be competing against guys using "stickey" and if they want to get on the map for drafting and college scholarships, they will be at a disadvantage if they don't use it.
So kids are getting trained at a very young age how to use it. And once they do, it follows them through college and the minor leagues, eventually ending up in the big leagues. And you would be very hard pressed to find a top D1 pitcher out there today that isn't using it. Because it is part of the reason they are "top D1 pitchers". Vanderbilt may have the most illustrious history of "stickey" use. And it dates way back to the days of the rise of the program. Talking David Price on up through Minor, Gray, Buehler and too many more to name.