I think they realized that IC and EV are both not going away soon, so why not keep their customer base instead of other competitors taking them away.
Also, they already have the advantage of real estate. They know that they can add a charging network cheaply in their gas stations than a new player in town building one.
I don't really buy the argument that they can limit supply to increase the price of driving EV.
I recently bought an EV and sold my IC car because it puts a smile on my face when I drive it. It was never a financial decision for me. Plus EV are insanely expensive, most of these people can afford a substantial increase in electricity prices
Like geez, you can buy two IC for one EV. I do hope that EV car prices go down significantly as it seems like a lot of people would want to buy an EV, but the price point is just too much