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I was wondering about that. I assumed there wasn't exceptions, because those can still be possessive. Oakland A's members or 13's unlucky superstition. I'm not surprised though, because English is a stupid mess of a language.

Not native either, but pretty sure apostrophe-s is about ownership whereas just s is about plural. eg.:

"It's a dog's bark."

"The dogs are barking."

Nah, but that is how some people view and use it. It doesn't bother me personally if it seems intentional to quicken clarity. It at least makes more sense to me than possession on a name ending in 's', E.G. Bernie Sanders' policies. It breaks down further if the Sanders had a family reunion, what is the Sanderses'? Sanders'? preference for food?

Not quite. No apostrophe usually means plural. With apostrophe means possessive or a contraction (what is to what's). Its/it's is an edge case where the possessive "its" has no apostrophe and contraction "it's" does.

All that being said, native speakers mistype all of these all of the time, so you don't have to worry about it for casual conversation.