This is my take on these appalling statistics
The mad rush to jump onto the mobile Android/iOS App hype has made this completely inevitable - and totally avoidable if cooler wiser heads had prevalied. So if you're a younger starting out developer or startup company where do you see the lucrative work over the past few years - of course in Apps because that's what all the clients want. So they tailored their companies / personal skillsets completely towards App world because browser based web apps were now old news and the demand was falling at some speed.
The older web app developers were starting to be seen as old farts especially those who didn't move into the new trend and it wasn't seen as desirable to bring their skills and experience on board, especially at the salary levels they had grown used to - why pay for all that when the enthusiastic youngsters would work harder and longer for less? Well now we see why it might have been a good idea as the youngsters repeat all the old mistakes because they've not got the experience to avoid making them.
Twas ever thus I suppose, but I've heard stories of this nature for a few years anecdotally. Things like REST services being totally unsecured. Reading and writing application state and data to files so that the app worked when offline, thus granting open access to the file system. A banking app should never have this sort of access, it should only work in memory, online, "convenience" be damned. Oh well, looks like at least there may be plenty of work available doing consultancy to sort out big messes with web based systems again.