Why didn't the EU force the removal of those requirements? Apple will keep playing games to make alternative stores uncompetitive and keep away unwanted developers.
8. The gatekeeper shall not require business users or end users to subscribe to, or register with, any further core platform services, as a condition for being able to use, access, sign up for or registering with any of that gatekeeper’s core platform services listed pursuant to that Article.
I have not read the DMA but in the gatekeeper section of the official website the Core platform services listed are AppStore, iOS and Safari. Let's suppose that you single out iOs, why should I sign up something about AppStore to develop apps?
(If they were pre-evaluating plans, the optimal play for the gatekeepers would be to propose something totally unreasonable, and then negotiate it to something that's mostly unreasonable but just barely acceptable to the EC. That would be a bad outcome for the EC. So from a game theory perspective, they're better of making the companies guess at what will be acceptable rather than negotiating, since the companies will want to be conservative.)
And they have a right to prevent apps that harm the integrity of the overall platform which is what notarisation is designed to prevent.
Also companies have always charged a fee for using their SDKs. Even today Epic does this i.e. 12%.
It's not Apple's devices, though.