Beware: Its events like this that cause organized resistance and then alternatives to Big Tech and even this board.
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I am one of those people, so I will respond.
> The barrier to jump in, or fork off and start over is far lower compared to a browser or file format.
False. Its way easier to switch browsers than for a company to switch to an alternative Python implementation. Cpython is the defacto standard that the other implementations follow. What you are suggesting is that if Python 4 breaks your code base you are free to fork off Python 3 and keep the just the changes you like. This is absurd.
> The biggest threat to an open source project is therefore not Big Tech collaboration, but project abandonment and lack of maintenance.
Python is in no danger of abandonment.