Nah, this is not true. In the end, no matter where you start from, the rich will always be business owners. You’ll never be rich working for someone else.

Doctor starting and running a clinic or a chain of clinics = entrepreneur
Lawyer starting and running a law firm employing Lawyers= entrepreneur
Cook starting a restaurant chain = entrepreneur
Teacher starting a tuition centre chain = entrepreneur

The only exception is that you already have a highly sought after set of skills to make your initial investment easier. Eg sick people will definitely need to see a doctor, so it makes it easier to attract customers. Especially with an ageing population, population influx in foreigners and major government HDB projects in our less developed heartlands, the demand of GPs will increase and if you can start a successful chain of clinics then you yourself can also make a huge payoff.