Uh, no… they want to deny claims. The best situation for insurers is that you are healthy for a while, then abruptly die of something that cannot be treated.
Uh no, they don't. Not if they're also the ones who provide healthcare. Simply denying claims isn't even remotely close to the financially (and obviously not the politically) optimal strategy.
The optimal strategy if you own both the insurer and the provider is a combination of premiums, copays, deductibles, and maybe even some totally unnecessary care to drive up volume.
Lower margin on dramatically higher volume is still dramatically more money. Lower margin actually provides political cover for your $400 billion revenue years.