… in case of those frameworks that support making of premium software products LGPL, MIT, or similar licenses are better than GPL …
They may be… but WordPress is already licensed under the GPL. So there’s thousands of people to get agreement from if that was going to change 😉
But, what it leaves off is that if you do this your premium plugin will become open source.
It’s not just including ACF in a premium plugin that makes it GPL’ed – it’s also creating the premium plugin as a derivative of WordPress (unless it was very clearly not derivative… but that would be hard to argue IMO!)
