It's a contraction to 'cause just with the apostrophe elided. Everyone knows what they mean and knows that this cause is different than the other verb or noun "cause." I also sometimes use its instead of it's in text because it's too annoying to fix the autocorrected (or not) spelling on a phone keyboard, not because I don't know the difference.
You also don't seem to like quotes very much. You have used them properly when you were referring to the token "cause". However you did not when you were referring to "its" and "it's" which made your contribution much harder to read.