Is there any prediction what skills would be in highest demand?
For the beginning,i would say crpto related ones.
Most definitely,untill Vanywhere reaches mass adoption.
A lot of people who will use the app will want to know more about crypto so it makes sense.
Im sure competition will be tough there,so better be sure about your skill

Competition might be tough,but demand will be high too,those things usually go together.Unless you opt for something like basket weaving,as someone mentioned earlier

.But then again,u might find fierce competition there too

When you give people an app like this that's easy accessible you can be sure you will create skill sellers for every market possible
so were ever you turn you will have competition.