[Aeolun]

I think you’d be working to add quality to your backups for free. Sure, they’d also give it to other customers, but what matters is that you have it (and henceforth do not have to maintain your own fork).

[SahAssar]

I think the point is more that you'd be giving away work for free that is only usable by people paying someone other than you.

[hotpotamus]

That's a more generous way of looking at it and certainly a fair point.