A long time ago it was ignorance. But with autotext, autocorrect, swipe text, etc... it's just the grammar/dictionary rules of that keyboard app doesn't get the context and just picks one. And people became too indifferent to correct it. To the point that now people, I think, just generally don't know NOR care which one they write. And a basic idea is that language changes greatly over time.
Pretty soon, loose/lose, loser/looser will become homographs. Like live/live, read/read, etc. We'll eventually coalesce around one spelling for both words and just use it.
Language changes. Nice used to not mean 'good' or 'pleasing' etc. Nice was not a 'nice' term to use for something.
Like, too, has seen change. Nobody says Likewise anymore. It's just like. We all know what we mean when we say like.
The biggest thing is that dictionaries are repositories of words. Not authorities of words. They simply document the speech and writing of words and their meaning as they change. They don't define words. They document the definitions already used for those words.