Laws that protected the IP rights of inventors were absolutely crucial to that process.
On the other hand, the development of the steam engine and its application is partly grounded in Trevithick's fierce rejection of existing patents (hence high steam pressure) and also in the rather loose enforcements of the Stephenson patents.
I say the big picture is that the steam engine was developed within a legal system that in general protected IP rights, at least respected them on a completely different level than before. Granted there are more pieces to the puzzle, but let's not forget one of the most important pieces.
High steam pressure isn't just about a wandering ant, but about the major step in the development of the steam engine, opening the technology to all kinds of applications, beyond just pumping.
As his story indicates so far it was not for the want of ingenuity that the industrial revolution did not occur before, but the social framework for transforming the society in the way that the industrial revolution did was simply not at hand. Primarily because the decisionmakers that held the power were tied to another mode of production, usually involving fleecing peasants.
That the industrial revolution needed the steam engine goes without saying. But the steam engine without the industrial revolution was a mere party trick.