If a mistake in grammar or punctuation becomes common enough then surely it has just naturally become part of the language. Languages evolve; they are not set in stone. Go and read some English literature written a few hundred years ago and it is totally different. Nobody made an official declaration about what can and cannot be done – it just happened on its own.
I think the mistaken use of the apostrophe with the plural ‘s’ and with the word ‘its’ (possessive) fits this category