Exactly.
They'll put the tax in place and write the law so it's easily avoided by really rich. They'll then drop the brackets down until it encompasses the middle class. The net result will be yet another tax increase on the middle/upper middle class while billionaires circumvent taxation.
Billionaires are the ones that fund the lifestyles of elected officials. Elected officials in turn write the tax laws so they're advantageous to their paymasters. That's why the super rich are usually democrats, they know they won't pay under democrats taxation schemes and the democrats anti-business mindset makes it very difficult for start-ups to compete with democratic donors established companies. Ask yourself how Bill and Hillary Clinton, neither of which ever made more than $200,000 a year when they were in office, are now worth $200 million. It didn't happen because they were really good savers.
There goes the Mars colonization scheme and the free Windows upgrades. Good.