Pros
Self-empowerment. Knowledge Application. (Answering questions that may look simple but require deeper understanding) Answers are Intangible Assets. With the View or Upvote count increasing for answers, that you have written some ages back, it feels great. Like a book for an author who gets revenue for his past work
Cons
Look at the positives and negatives. The fact is, part of your preparation is going to, or at least should, include researching the company. Focus on you. Keep your answer parallel to the values of the company.