We have the same with fiber to the home in France. When a company lays the fiber, they have to allow others to use it too (they are paid for that service, but the amont is regulated).

When fiber arrives, there is a 3 months waiting period before any company can provide the service. This is intended to give enough time for everyone to prepare an offer.

When I got mine, I called the regulation authority (Arcep) who gave me the date and hour my line opens. On that day I called my preferred provider who told me "it is coming! we will call you!" and then the one who laid the cable who told me "we can come in 2 days". I chose the latter.

A few years later the preferred one finally made its way to my area...