without cause, without notice, and probably without consideration

Also without malice. Good brother footpad spent a long time re-organizing and cleaning up the Tutorials front page as described in Updating the Tutorials Node. Far more likely that one just fell through the cracks.

Though he may sometimes appear divine, footpad is human like the rest of us. Considering how strongly he feels about abuse of editorial powers, I can't imagine him dropping a tutorial on purpose without talking to everyone else first. If nothing else, you would have received a /msg.

Update
In regards to your second question, no, there is no level requirement for submitting a tutorial (or book or module review).

Update 2
I just checked, and your node is on the list of nodes to consider (read footpad's writeup to understand why it's there) and has two "yes" votes for being promoted to tutorials.

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