Microsoft Corp. President Brad Smith said it’s time for antitrust regulators in the U.S. and Europe to discuss tactics that app stores use to take advantage of those who want to distribute their software.

Some app stores create a far higher barrier to fair competition and access than Microsoft’s Windows did when it was found guilty of antitrust violations 20 years ago, Smith said Thursday at an event sponsored by Politico. He didn’t specify which app stores he was referring to, but Apple Inc. and Alphabet Inc.’s Google operate popular ones for their devices.

“They impose requirements that increasingly say there is only one way to get on to our platform and that is to go through the gate that we ourselves have created,” Smith said. “In some cases they create a very high price per toll — in some cases 30 per cent of your revenue has to go to the toll keeper.”

The European Commission Tuesday announced it’s investigating the way Apple regulates payments on its app store, concerned that developers are unfairly forced to provide a share of their revenue to the iPhone maker.