I'm not sure where this idea of high profile target comes from. The sim swap attack is pretty common. People just need to be in some credentials leak DB with some hint of crypto trading or having some somewhat interesting social media account. (either interesting handle or larger number of followers)

There are now organized groups that essentially provide sim swap as a service. Sometimes employees of the telco company are in on it. The barrier to entry is not that high, so the expected reward does not need to be that much higher.