A billion dollars is a hard sum of money to wrap your head around. There is basically no ethical way to make a billion dollars. If you have a billion dollars it’s because you’ve stiffed a lot of people a lot of the value they created and kept it for yourself.
Normally these are optional wellness features. Insurance companies will bug you to download a meditation app or go get a checkup because preventative medicine is cheaper.
These things are generally safe to ignore, if you are really concerned though the best course of action would be to call the number on your insurance card and ask them if anything is up. If you owe them money or need to do something they won’t be shy about it.