Without having watched the videos, to say that people made content using his name and made money off of it without Feynman knowing is disingenuous. Ralph Leighton recorded the conversations as Feynman was struggling with cancer. There are even portions of those recordings out in the web [1]. Feynman was fully aware of the books because there was apparently a scandal where Murray Gell-mann threatened to sue Feynamn and Leighton because of some mischaracterization. Feynman was apparently hurt and issued a correction in the subsequent version of the book [2]. So it seems that he was FULLY AWARE and actively endorsed the book.

[1] https://www.amazon.com/Feynman-Tapes-Research-Chemist-storie... [2] https://feynman.com/stories/al-seckel-on-feynman/