It is still being done. TN1 appears to have broken up, but it appears that some of the ex-members are reforming into a new group or considering other ways of how they can move forward.

It’s my understanding that most cleanup is done in PF Clean, and that Photoshop is only used for really damaged frames. I have no idea how PF Clean works, but it’s my understanding anyway that its duplication tool is significantly more advanced as it can use the frames which exist either side of it to guide it towards a more accurate clean-up.

Also each 4k scan is something like 20 TB in size.

Oh I forgot to mention, as a Software Engineer the greatest contribution you could make is to create an open-source alternative to PF Clean - that would allow many more people who don’t have $6k to spend on it to contribute to such projects.