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Gas stations already do this, they offer deals to certain credit cards, grocery chains, or even if you buy a car wash.

There's a bit of a difference between a promotion of "buy this, get a discount on this" on a small transactional item like a car wash. The company with the most electric vehicles giving special pricing at the most electric car charging stations moves into tying territory very quickly.

If gas station were invented today, each company would require a monthly subscription.

If Toyota had their own gas stations, I'm pretty sure they could offer a discount to their customers. Why not?

Antitrust

How does that violate any antitrust laws?

I think the main issue would be tying under antitrust law, although that probably would only apply under the current DoJ approach if they sold the gas below cost.

My old S has free supercharging for life, the cost is subsidized in the price of the vehicle.

Yeah but it wouldn't be illegal if the rationale was that they had priced some gas discounts into the Toyota purchase price as part of the deal.