The cost to Enbridge for spills is less measured in remediation dollars, and more so in the license to operate. You might be able to cover the cost... but then when you go to negotiate for permission to build - or even the permission to continue to operate - that's when you pay the cost. At a very minor risk of doxing myself, I was absolutely around during the fun in Michigan. Matter of fact, I spent a couple of weeks there. I was also knee-deep in the next several years of activities relating to it. We paid a much greater cost than the simple dollars to fix.
As to the current safety culture, yeah, the foot was taken off the gas pedal. But it had to be. The overcorrection to 2015 was unsustainable... the company had to figure out where the sustainable lines could be drawn. So here we are.
It's worth noting that (outside of NG) in 2023 I think something like 100 barrels were spilled. That's such a low number that it doesn't even register in 6 9's of safety. So if you're going to talk about events in the "pipeline incidents" category, you're kind of waving your hand and saying, "Just you wait and see!" because the data doesn't suggest it's manifesting.