You confuse open source with free software, and all the shades of it.

GPL/copyleft exist because some people make products because they want to help and improve a community. Not just to let the product go in the wind, "whatever happens to it" (meaning corporations using it for profit extraction and/or the exact opposite goals). Even if AI made this less defendable by legal means.

This isn't because these people are "control freaks", but because of their beliefs and purposefully chosen legal framework.