The problem with servant leadership is twofold:

Firstly, in 'proper' servant leadership as taught by Greenleaf the leader is supposed to put the church before their own needs and wants. It is not about serving the people who report to you; it's about serving the organisation first. In a business context that's horribly toxic and a great way to spend years being exploited by a company that will grind you to burnout for very little money. Thankfully most people don't actually follow what Greenleaf teaches because they think it's about the people.

Secondly though, people don't bother to read much about it. They hear the term and a basic summary, and then fill in the blanks based on their own biases and assumptions. Consequently when someone says they practise servant leadership you can't know what they mean unless you know them well. People who practise their version of servant leadership assume other people mean the same thing by it, and automatically align themselves with that person based on (probably) false assumptions. It is not a helpful term because it's used for a huge range of leadership styles.