While I believe that this is a tactic that gets used, it shouldn't work. And therefore it is points to probable regulatory failures. Note that the theory here is that the majors will offer cheap prices if the infra is duplicated.

That means "I" (my building) could build my (our) own fibre connection and then use that as leverage to get cheap internet without having to actually run it. It'd be a bit silly, but sounds long-term profitable.

The focus should be on enabling this sort of competition.