There are people constantly messaging me to give bad reviews for sleepy in exchange of money

I’m not a regular poster here. In the past I have posted in favour of sleepy classes Sociology course as I am also a part of it. I have mostly done it on comments which criticise the batch superficially. Now I receive messages asking me to give bad reviews and feedback of sleepy classes Sociology. When I’m trying to open those messages all those accounts are deleted. What is this pattern. This also brings bad reputation to this thread. Why are we behaving so corrupt already.