the digital age has made it easier for more and more money to accrue to the topI'd assert it is related to the job market which in turn has suffered due to some of the points you've listed along with a change in direction that some (many?) individuals simply aren't geared up to adapt to.
Again yes it's a simplistic way to look at things, however I think of the multiple scenarios where towns had a main employer that essentially sustained that area. When that industry declined and the employer closed, the required backfill of other employers didn't happen.
I know there are other factors e.g. those who simply can't be ar5ed to work or educate themselves, however it's a multi-faceted issue for sure.
I'm sure I watched a tv doc that featured Gary Stevenson. He made some good points about the structure of society and how said structure essentially ensures the poor will (generally) always be poor and the rich will keep on getting richer. Can we ever break that model? I doubt it ...
lets take Uber: 20 years ago it would be possible to cream off profit margin from millions of taxi drivers all over the world and make millions for a handful of business owners -the taxi drivers have to work really hard, working all hours, while the directors of Uber just sit by their poolside watching the money roll in
the same applies to booking.com, amazon, etsy, ebay etc etc
and yes I do realise those businesses create lots of opportunities for people, but they they operate to cream off as much as they can, so they cna make millions, maybe billions