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This is simply false. An SDK is not DRM. They offer optional DRM but the platform itself is not managing rights inherently.

In practice, how many games opt out of the DRM, and for would one still be able to play those games should their steam accounts be cancelled?

I'd call their drm opt-in, not opt-out.

> In practice, how many games opt out of the DRM

but the vast majority of the store is DRMmed.