I am sure there are quite a few Krakatoas out there.
I once described them to my young daughter as “pimples” that can just fester for a long time before popping. The bigger and redder…the more dramatic the “pop.”
Her middle school teacher thought that was gross comparison.
I seem to recall that there are 52 active volcanos in the world currently.
With Etna on the east side of Sicily the most active.
There was just an article the other day of a crack opening up on the side of it. Where they did not suspect it would.
The thing about Etna is that the city of Catania, Sicily(300K) is just to the south about 25 miles away. Taormina is just to the north about 40 miles.
There are a million people living relatively close by. Yet they go about their lives while it just blows ash into the air on a regular basis. Occasionally, shutting down the airport.