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They can do that regardless of the license since they own the copyright. As long as they do not accept external contributions or require a CLA it does not matter what license they offer, they can still make future versions proprietary.

Even if they accept contributions normally (e.g. under the same license), the above licences will allow them (or anyone else) to make a proprietary fork.

True, that's why there needs to be a distinction between "GPL" and "GPL with CLA".

> they do not accept external contributions

They do tho.

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