Is there an official page for Protober? I'd like to learn more about the rules, like is there a time limit per day, is there a prompt list, etc.
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Its just a user driven thing. I think someone did it in 2016 for the first time, then 2018 stuffed wombat did it and in 2020 it was nyunesu who tweeted out about it.
I'm using inktober prompts when I have the time. The main thing is to force you to make stuff. So don't worry about prompts, time limits etc. Just make stuff.