At least the government has already gone after the big fish and common loopholes that corporations and the ultra-wealthy perpetually exploit to maintain single digits tax liabilities. Oh, wait....
The cynical take is that it's not about the money, it's about having the power of arbitrary enforcement coupled with the longstanding ability to freeze accounts and seize assets in response to tax evasion. Imagine if the feds has an "off switch" for most small businesses and self employed individuals they could use to enforce compliance.