This doesn't apply to me, but I'm rather curious, and it might apply to someone else.
Spain is apparently being reasonable about travel difficulties, and I presume other countries are similar. But part of that article is interesting: the five requirements for an extension. I can imagine some persons being unable to meet some of the five requirements there.
Are there any known cases of penalties for overstay when the "offender" had no way of avoiding it? Or any country that has explicitly stated that they will enforce such penalties in spite of the "offender's" lack of options?