I can see and understand the technical limitations, but tools like Microsoft Word seem to do a much better job than Google's spell checker, even in things like Google Docs.
Google search will often suggest splitting up words and sometimes even does it transparently, which can give entirely wrong results because suddenly Google matches words across a sentence instead of specific compound words. It's kind of frustrating to have to resort to quotation marks for some single-word search terms.
I get the feeling Google's spell checker doesn't check spelling, it just tweaks the input until it manages to find more results. Not quite the same, because a lot of "fixes" often have entirely different meanings in my experience.
Out of curiosity, what is your native language, Dutch? Can you give an example of something that Google’s spell checker screws up?
* hoofdaannemer - hoofd aannemer : main contracter - person who takes heads
* wegomlegging - weg om legging : road closure, a road around a legging(pants)
* dagverse vis - dag verse vis : catch of the day - goodbye, fresh fish
This twitter has many such errors in the wild.
https://mobile.twitter.com/spatiegebruik
Not all spellcheckers suggest it wrong, but almost all that rely on statistics, will get it wrong: hoofdaannemer (or hoofdanything), will occur far less than hoofd or aannemer.
This, I fear, is forming our language use. As people rely on tech, they'll follow the suggestions and wrong use of space will turn an actual problem.
Edit: formatting.
And with so many people just accepting Google's anti-compound spelling as correct, many people will be mostly exposed to a version of their language with more spaces, and it'll start to "feel" right to them.