Since the CSAM attacks, I have disabled pictrs on my instance until I can turn off caching images from other instances. However, I haven't been keeping up on pictrs development. I know there were talks about making this feature, but I am unable to find any information about pictrs and the state of development.

Is pictrs open source? If yes, does anyone have a link to the source? If no, is there anywhere I can find information about the state of development of the project? The only thing I can find is its docker hub page here, which has a completely blank description.