When it's to drive out the competition, I think it's called "dumping". (I first heard of this as "chip dumping", as in semiconductor chips.) https://en.wikipedia.org/wiki/Dumping_(pricing_policy)

It can also be to build a market, to encourage customers to invest in building atop this.

In any case, I think no customers should be making assumptions about costs too far ahead. (Since the price could go up or the price model change, the supplier could get out of that business, supplier could give your competitor a better deal or just cut you off , near-future tech evolution necessary to be competitive might have very different pricing or availability to you, etc.)