It does concern me when people say that the internet should be unregulated, especially given the recent vote in the US and the likely upcoming votes in the UK.

Monopolies are very easy to form on the internet, and in the interest of improving everyone's use, we need to try to avoid them. Walled gardens currently trap people into one service and limit the ability to swap between them, similar to "forcing" you to use just one company for your construction work, no matter the price.

I haven't heard a great answer to this problem yet, if one even exists. Is there a way to attempt to prevent these from forming which can be practically implemented?