Not quite:
ABC and CBS at least let Jim make pilots, and CBS was on board with TMS at one point, but then opted out the very next day.
But another thing to remember too, is that the Kroffts were making shows specifically for Saturday Morning, while Jim was trying to sell the networks on the idea that puppets could be primetime as well; puppets seemed more logical for Saturday Mornings than they did primetime.
ABC and CBS at least let Jim make pilots, and CBS was on board with TMS at one point, but then opted out the very next day.
But another thing to remember too, is that the Kroffts were making shows specifically for Saturday Morning, while Jim was trying to sell the networks on the idea that puppets could be primetime as well; puppets seemed more logical for Saturday Mornings than they did primetime.