I was already wondering when this would happen, so good to hear you've had the chance to do it.
As for retaining inactive accounts, you're quite right! The only way to really be for sure would be to ask these people personally, is quite invasive, and even then, they might well decide to dust it off again in the future.
(Just for fun, I see that the amount of available usernames is about 1,56 * 10^39, so there will always be something to pick.)
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I was already wondering when this would happen, so good to hear you've had the chance to do it.
As for retaining inactive accounts, you're quite right! The only way to really be for sure would be to ask these people personally, is quite invasive, and even then, they might well decide to dust it off again in the future.
(Just for fun, I see that the amount of available usernames is about 1,56 * 10^39, so there will always be something to pick.)