Other platforms have a half dozen terminal programs, three of which are usually very good, and Windows has one that looks like it was hacked together on a weekend in 1998.
PuTTY is great, honestly. It's not pretty, but neither is the windows console nor PowerShell.
How much energy do you expect me to waste evaluating and choosing new ones when the one I have works just fine the way it is? I have better things to be doing.
Linux in particular is filled with "well enough" solutions that should be striving to be better. Although there's misfires when controversial things like systemd happen, there has been steady improvement in other areas. Imagine if Nginx had never happened, if NCSA httpd was "good enough"?
The Windows user base deserves better than PuTTY.
Occasionally I get tripped up on linux terminals due to the additional requirement that I "ctrl-c" to activate a copy, but that is extremely minor since that method of copy/paste is shared by almost every other tool I use except for putty.