Hence, from a linked point in the article:
> AARP, the consumer advocacy group for older Americans, sued the federal government in 2016, arguing that the rules governing the [wellness programs] violated anti-discrimination laws aimed at protecting workers’ medical information.
That lawsuit against Kaiser was over individual coverage. Kaiser realizes all its savings by carefully maintaining very health (i.e., young) pools. The medical information stuff is the legal argument, but it was really a lawsuit about making people do stuff that disproportionately negatively affects old people.
If you try the wellness program for people whose enrollment is through their employer, and your employees are disproportionately not college educated or young, the wellness program of the kind you and I are familiar with will not be effective at either lowering costs or improving health outcomes. That's why this program was sort of doomed to fail.
There exists an as-of-yet unobserved program that gives people money in exchange for behavior modification with positive health and cost savings outcomes. It will probably look more consuming entertainment--stuff that has evidence people will do over long periods of time. We're a long ways off from finding the appropriate design of such a program.