The idea that there is a "right" way to spell in English is very recent; English has been around for about 1500 years, and Modern English for about 700, but the concept of correct spelling has only existed for about 150 years, and is yet another of those "ancient English traditions" the Victorians were so keen on that they invented them from scratch whenever they didn't exist, or didn't conform to 19th Century English moral, religious, and/or royalist ideas.
Shakespeare didn't give a rats ass (nor a rattes arse) about spelling; He was perfectly comfortable with spelling the same word in several different ways, and even extended that practice to the spelling of his own name.
A good part of modern English spelling and grammar stems from Victorian schoolmasters' desire to bully children, and seems to have no other reason to exist whatsoever.