As someone who checked it out for physics here's my experience:
Anything that could easily be found and be correct that would be found on chegg, would be easily repeated by chatgpt, and with usually clearer solutions that was easier for slightly different problem prompts.
Anything that could not be well answered by chatgpt likely would not have a good solution on chegg, being either outright wrong, or extremely confusing as an answer.
As someone who is currently studying dark matter, MOND is currently disfavored in the field of cosmology. It does not as simply or effectively describe galaxies closer to home, or observations of the cosmic microwave background. These galaxies pose a challenge to lambda-CDM, but that does not prove MOND correct.