* If you mean something they felt obligated to do due to their position or responsibility: Many people in public service could fit this description. For example, a president might have to make a difficult decision that is unpopular but they believe is necessary for the good of the country.
* If you mean something that was required by law or contract: Many famous people have obligations they must fulfill due to legal or contractual agreements. An actor might have to complete a film, a musician might have to perform a tour, or a celebrity might have to fulfill an endorsement deal.
* If you mean something that was essential for their career: Many famous people make sacrifices or do things they don't enjoy to achieve their goals. For example, a musician might have to tour relentlessly to gain recognition, an athlete might have to train rigorously to compete at the highest level, or an actor might have to take on roles that are challenging or uncomfortable.
Some examples that could fit the bill:
* Oprah Winfrey: She built her empire on hard work and dedication, making difficult choices to build her brand.
* Martin Luther King Jr.: He faced immense risks and hardship while leading the Civil Rights Movement.
* Malala Yousafzai: She spoke out against the Taliban despite facing death threats and becoming a symbol of hope and resilience.
Ultimately, what constitutes something someone "has to do" is subjective. It depends on your interpretation of obligation, necessity, and personal values.