Through the kunstuitleen they leased and sold art to galleries and private homes. It was like a library for contemporary art which paid struggling artists and their families, while also exposing the public to more art.

To say that "no one wanted" is a massively overblown. Thousands of art pieces lived happily in many Dutch homes.

For one, they ruled that the wealth tax is against the EU human rights agenda. So they're scrambling to come up with a solution. Even with this tax, the projected weight isn't terrible. For reference my wife and I are CoastFIRE here with ~2mil USD in NW and the tax is marginal compared to our returns.

Skills wise, I would recommend spending a few years learning C++ at the least, try developing an engine from scratch, build an ECS, build some basic multiplayer implementations. I wouldn't expect much of your web experience to transfer, and you would most likely be joining the industry as junior.

Stability wise, if you have any backend experience, applying for infrastructure SWE roles that handle online services for video games is an alright bet, but that job market is quite small.