I mean, the idea is, that the tarriffed stuff becomes less attractive compared to the non-tarriffed stuff due to the higher price, so less people will buy it and instead the nationally produced alternatives thus strengthening the national economy and and weakening the tarriffed ones.
Of course that can only work with stuff that has nationally produced (or at least non-tarriffed) alternatives.
And you get an annoying watermark. And an even more annoying operating system, so it’s not really worth it.