Pro tier is for Enterprise customers who need extra-long term support and are willing to pay for it. Canonical is meeting a market demand so they can remain competitive for use in those environments, which is good for everyone. It’s benign
Then please show me the button (and I mean button, not command-line exclusive settings or config file entries in /etc, and certainly not unofficial trickery like third party repositories that replace Ubuntu advantage packages with an empty decoy) that says “Thank you, I don’t need Ubuntu Pro, please stop nagging me about it”.