The title makes it sound like Rotten Tomatoes deliberately did something shady. What actually seems to have happened is:

1. Rotten Tomatoes aggregates critic reviews. As far as I know, those critics aren’t really affiliated with Rotten Tomatoes.
2. Some of the critics that make up that aggregated rating got bribed to increase their evaluation of the movie.
3. Consequently the score on sites that aggregate reviews like Rotten Tomatoes increased.