> more open choice because it forces the project
A true morality must be based on consent, not coercion. Humanity may not be there yet, and therein lies the argument for force (and thus copyleft); but the ultimate goal should always be to reduce its necessity.
I see this, and the spiritual example that immediately comes to mind is that which is labeled as "crime". Would it be more moral that a murderer must first consent to being judged and sentenced, or that there is a system which automatically comes into play to hopefully deter but also punish it when it happens?
Allowing closed-source to exist is always the less moral choice for many reasons (one example being ecological sustainability)
Is this not the paradox of tolerance restated in different terms?
BSD license is unrestricted, it tolerates taking open source and closing it, thus always being at risk of things closing down.
GPL license doesn’t tolerate taking from open source and closing it, thus ensuring things stay open.
It’s not coercion. You’re free to not use it, or alternatively do what these folks did, write your own. Coercion would be forcing people to use it through some mechanism, which clearly isn’t possible with GPL.