> threat of a breach of contract is not a breach of contract

I don’t know EU law. But anticipatory breach is enough to trigger damages under American law, and “is an excuse for non-performance by the non-breaching party” [1].

[1] https://www.law.cornell.edu/wex/anticipatory_breach

There's nothing about some random contracts I can see in DMA. DMA however does say that the gatekeeper (Apple) isn't allow to block or retaliate against competitors. Or users for that matter.

> nothing about some random contracts I can see in DMA

There are laws other than the DMA?

(Anticipatory breach is incorporated into EU law through the UN CISG [1].)

[1] https://link.springer.com/chapter/10.1007/16247_2020_13

And how exactly does that then allow breach of DMA provisions?