The top 1% (which includes a lot of people we'd consider to be merely quite well off rather than wealthy) paid 23.9% of all taxes and 25.5% of federal taxes in 2024. That's while making 20.1% of all income, so it's not a massively unfair burden on them.
https://itep.org/who-pays-taxes-in-america-in-2024/
Even if you only look at federal income tax, which is more progressive than other American taxes and thus exaggerates how much the wealthy pay, the top 1% pays 40.4% of the taxes.
https://taxfoundation.org/data/all/federal/latest-federal-in...
Healthcare.gov was widely discussed in the tech community at the time. People were constantly incredulous at how bad it was and how much it cost. Maybe you forgot, or weren't there, or expect people to still be talking about it over a decade later.
In any case, that's not where the money goes. That kind of waste is almost incomprehensibly large to an individual, but it's insignificant in the federal budget. Social Security was $1.6 trillion last year. Medicare was another trillion, Medicaid was two thirds of a trillion. Nearly all of that spending is paid out to recipients/providers. Overhead is low single-digit percentages of the total. Defense is another trillion. Interest on the debt is another trillion. You could wave a magic wand and make every single project similar to Healthcare.gov free and it wouldn't make a noticeable difference in federal spending.