The implication there was that because Salesforce owns Heroku, they would be able to pay up major cash if Rap Genius got some other Heroku customers involved in the lawsuit.
If AWS was able to be sued by every customer who didn't understand how their infrastructure config worked with the underlying EC2 network, or did something incorrectly for a time due to a documentation mistake there would be more lawyers working at Amazon than engineers.
Also loss in productivity because their documentation was misleading.