Squeezing out mountains, mathematically, on Jupiter's moon Io
The odd-looking mountains on Jupiter's innermost moon, Io, are made by a tectonic process unique to Io (And maybe the early Earth), suggests a numerical experiment. Ref. Source 8x.
Waves of lava seen in Jupiter's moon Io's largest volcanic crater. The most active volcanic crater in the solar system, Loki Patera on Jupiter's moon Io, is thought to be a lava lake that periodically brightens because of overturning lava. A UC Berkeley team regularly monitors Io, and took advantage of a rare 2015 event, Europa passing in front of Io, to map the surface of the lake in detail. They found evidence for two massive waves of overturning lava converging toward the lake's southeast corner. Ref. Source 2b.
I absolutely agree with you. If some of these moons are this geologically active there are probably a lot of resources to be had. That could be the stepping stone to help us get out of this solar system. Of course, first we have to figure out how to get to them and survive. Then we can about plundering them like we have Earth. .
Oh we have the means to get there and get back that is not the issue. The main issue is how fast we can get there and return. Think of the resources we can get in the asteroid belt that is between Mars and Jupiter. Imagine the metals that we can plunder from there and make earth more protected from possible rocks hitting or planet.
The Moons of Jupiter I feel have a lot of things that we can use and possibly even be able to live on them.