FWIW I checked the website after reading your comment and I found out that
the license terms changes were announced in 2021 with the introduction of Sublime Text 4 (
https://www.sublimetext.com/blog/articles/sublime-text-4).
I also didn't notice that, it feels like an implicit subscription.
However, I should point out that the developers of Sublime Text have always been quite generous in letting people use the app without paying, while only showing a nag window every once in a while.