With art, traditionally, once the artist finishes their work, the piece is complete. They can go on to produce less admirable art, and their past art remains static.
With software, a lead developer will remain involved to influence future versions of the software. They are an integral part of the project, tasked with informing those who develop and use it.
Their leadership attracts like-minded contributors who will remain even if they are ousted.
They have the power to control and corrupt.