In most fields there is little incentive to change things when the company itself isn't too affected in case of hack. Stocks go down for a week, then back up. General population doesn't seem to care enough to stop using the services, and does not understand enough about privacy/value of their data/need for encryption. So why would a company care ?
If being "ethical" and more devoted to privacy becomes a trend, perhaps there will be a stronger drive to follow security experts' advice. Did Whatsapp get a surge in users after enabling end-to-end encryption?
https://hbr.org/2015/03/why-data-breaches-dont-hurt-stock-pr...