What happened to the proper use of the apostrophe?

Here are two of many examples:
1. “Happy Mother’s Day! Wishing a day of celebration to all of the mom’s out there.” (on FB)
2. “Come check out our mirror’s and chairs on sale!” (on a sign outside of a furniture store)

As someone who is notorious for typos, I can understand the occasional error. The misuse of the apostrophe just seems to be alarmingly consistent.

Have the rules changed? Does it have something to do with autocorrect and lack of proofing before posting online?

It’s a minor irritation as I tend to re-read the line to see if I missed something. No sleep will be lost over it. I’m just curious.

Did the rules change? Is it due to the auto-correcting feature and not proofing a post before hitting send? (Obviously this doesn’t apply to the painted sign outside of the furniture shop). Something else?

One inquiring mind would like to know if you have noticed it as well, and if there is a plausible explanation.