I don't fully understand. You cannot take back your public contribution, just as you cannot ask the patent office to erase the patent from all records and have everyone aware of it forget about it, and remove each and all references that build on that patent.

The world would be a much different place if smart people in the past hadn't invented Copyright and Patenting, which both are mostly being misused and are not used to foster innovation. Back then it was normal to hold onto secrets and patents and copyright were invented to incentivize publication under well-defined and not too long exclusivity periods after which other can freely improve on it. But today we have 20 year patent monopolies and Disney copyright absurdity.