That's just because the legal options were easily available, right? Kind of like people stopped pirating as much when Netflix was actually decent. But now the tides are turning again, so maybe the fan subs will start coming back as well.
Still, though, I wonder if that mindset is still going to be around.
I remember seeing (I think Netflix release) of Komi-san can't communicate, noticing A lot of things being missed, like Komi's literal main manner of communication (A notebook where she writes) not getting any translation for some episodes, or a lot of things I'd have to fill others in that normally at least would have been a T/N in fansub
It was bad enough that I went looking elsewhere to see if I had missed more than I realized, and the fansub did have everything covered