Interesting observation. Here are my thoughts. Major reason anyone would be unhappy to work in Wipro or Infosys would be salary. Other than that, I have not seen or heard people complaining about toxic work culture at Wipro or Infy. Sure, there are few teams always that are like that but we are talking about toxic work culture being a common occurrence across the organization (start-ups)
Now, for those, who are unhappy with salary, they can always upskill and switch to product companies. Reason for low salary in WITCH and high salary in FAANGs is purely unit economics, nothing else. But, in terms of wlb, WITCH are generally better. Real toxicity would have been making people work at low salary, firing them on whim, misbehaving with employees, fear mongering etc. It's rare to find all these in Wipro or Infosys unlike startups.
A while ago, someone in this forum mentioned about toxic co-founder of Quantiphi. So simply going by general pattern, older entrepreneurs may have created organization that are not paymasters but they haven't by design created organization where toxicity is practiced openly.