There hasn't been any fire lately, lets remove the fire extinguishers from the building.
Just because you don't see it happening overtly, doesn't mean that it's not needed. When dealing with private interests you have to presume that if something is allowed and will result in a marginal, even if insignificant rise in income, firms will do it. And considering that they've attempted to do it before, it's preferable to pursue regulation that would result in disincentives to pursue such actions, rather than let them to their own devices. You would remind a kid not to eat cookies before dinner, even if they know about it.
Just because you don't see it happening overtly, doesn't mean that it's not needed. When dealing with private interests you have to presume that if something is allowed and will result in a marginal, even if insignificant rise in income, firms will do it. And considering that they've attempted to do it before, it's preferable to pursue regulation that would result in disincentives to pursue such actions, rather than let them to their own devices. You would remind a kid not to eat cookies before dinner, even if they know about it.