By GPL, they're only obligated to release an offer that allows costumers to request the source code. They can still keep the source "closed" by default.

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globular-toast a day ago | parent [-]

No they have to actually fulfill that request too. Once someone has the source they are then free to distribute it.

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growse a day ago | parent [-]

I don't remember if this is in the original text, but is there a time constraints on distributing the source on request?

If a user asks for the source, and the distributor says "sure" and then delivers it 12 months later, have they violated the license?

	▲	globular-toast a day ago \| parent [-]
		It has to be the source of the distribution the user currently has a copy of. So they can't just say "sure" and then wait until the next public release. I'm not sure about timeliness, though.