I've also heard that there is anger when non-Indian scholars study Sanskrit. Cambridge shut down their Sanskrit program, after 150 years. https://www.insidehighered.com/news/2016/04/12/scholars-who-...
They may feel that it is harmful to the Hindutva interests when scholars write about the procedure for cow sacrifice mentioned in Yajur Veda or the racism and misogyny perpetuated by Manu Smriti or the Soma drinking revelry in Rigveda.
These efforts to stop others knowing these scriptures are happening since pre-historic times and even codified in Hindu Law.
Dharmasutra says "If he (Sudra) listens in on a vedic recitation, his ears shall be filled with molten tin or lac; if he repeats it, his tongue should be cut off; if he commits it to memory, his body should be split."[1]
Dharmasutra, written circa 600 BCE, is a book on Hindu Law and Sudra is the lowest class in the Varna system.
The ban on Wendy Doniger's book in India is a case in point.
References:
[1] https://books.google.com/books?id=gnVxqvPg9a0C&q=lead#v=snip...
[2] https://www.sacred-texts.com/hin/manu/manu05.htm
[3] https://www.tribuneindia.com/news/archive/features/a-few-rea...
Doniger's book is not "banned". It was withdrawn by the publisher - because it was offensive. Details in same wiki link.
Another such "scholar" wrote extremely offensive passage on Lord Ganesha and got away with it.[1] Hindus have tolerated abuse for so long and they continue to do so. Try letting cats out of the bag on Abrahmic religions.
[1] https://hwpi.harvard.edu/pluralismarchive/news/hindu-student...