I'm not sure if you are serious or not with that proposition that would treat gatekeepers more strict than monopolies.
Regardless, I wanted to point out the obvious: each new broad regulation increases the cost of operating in the market where said regulation applies. The gatekeepers of today might not leave, but every new potential newcomer will calculate is it even worth it to operate in a market like that? Maybe it pays off to invest hundred of millions into lawyers and lobbying instead of technologies? Or maybe we'll skip EU market altogether (for reference, according to a courtroom statement Apple gets 7% of their revenue from Europe)
Regardless, I wanted to point out the obvious: each new broad regulation increases the cost of operating in the market where said regulation applies. The gatekeepers of today might not leave, but every new potential newcomer will calculate is it even worth it to operate in a market like that? Maybe it pays off to invest hundred of millions into lawyers and lobbying instead of technologies? Or maybe we'll skip EU market altogether (for reference, according to a courtroom statement Apple gets 7% of their revenue from Europe)