Historically Pantone has not charged a fee for Adobe to map the Pantone colorspace because it was advantageous for Pantone to not do so. The rationale being that the more widely available the Palette, the more likely it is to be used in print products.

Today Pantone has decided that it no longer wishes for that information to be shared freely and has compelled Adobe to stop mapping the colorspace by requiring they pay an outrageous per-user fee to do so.

Adobe recognizes that the overwhelming majority of it's users do not need Pantone, even if they're inadvertently or mistakenly using it. So they are unwilling to pay a per-user fee to enable a feature only a small subset of their users actually need.