The cultural left is against her for being very visibly transphobic (along other things). Additionally religious reactionaries historically don’t like the fact her books are inspired by historical witchcraft practices, as pointed out in the meme.
To quote wikipedia’s summery:
…Whited asserted in 2024 that Rowling’s sometimes “flippant” and “simplistic understanding of gender identity” had permanently changed her “relationship not only with fans, readers, and scholars … but also with her works themselves”.
https://en.wikipedia.org/wiki/Political_views_of_J._K._Rowling#Transgender_issues
Pretty much impossible, especially with so many eyes on the project. It is possible to intentionally introduce vulnerabilities into open source code and use that as a backdoor but for projects like tor keeping that hidden for long periods of time is incredibly difficult due to the number of people independently auditing the code.