Fluid Spelling

I have found spelling to be less rigid than in Canada. I have seen some similar sounding letters replacing each other. One example is the word for beer. I have seen, “cerveza”, ‘cerbeza”, “cervesa”, and “cerveza”.

Another one that has confused me is that some of my Mexican acquaintances spell “voy, “boy”.

And why do Americans spell words “differently”? “Colour” becomes “color”; “labour” becomes “labor”; “centre” becomes “center”; “grey” becomes “gray.

Go figure.