That said, there are a lot of reasons why someone might be struggling with money. If I was the creator, I wouldn't object to someone using an unlicensed copy forever in that case.
You are however limited to 3 years of updates, so if you want to keep up to date, it is $80 for 3 years. Which if fine for me, it is the one piece of software I used the most except for the browser and OS, I even use it to make money, $80 / 3 years is not much.
It is also the kind of software I like to support. It is... respectful in that it isn't a resource hog, runs fast, launches fast, and it doesn't try to be anything but a text editor. No ads, no subscription, no cloud, no AI, no slop, no dark patterns, no enshittification. Just an executable that does what it say it will do, and does it well. I wish it was open source, but it works well enough out of the box to not need it.
And tbh, Sublime Text is pretty stable and the kind of program you could probably get away without updating for some time if you wanted to. Things like LSP support are in 3rd party packages (that are open source, not subject to the license), so you'd get updates for those anyway.
I do suggest people pay though, it's cheap for a one-time purchase. The only reason I've ever seen the message at all is because I spent months being too lazy to dig up the license key to send to my work email. (That should also say something about how little I was being bothered by the message too)
And then add
“update_check”: false