The giveaway is the "in 2026", which implies that it would not be a dark joke in other years.
Thus the poster is evidently indicating that:
The legal system has been undermined and been shown to have no integrity because it allows illegal actions by the rich and the political class.
Journalism has been undermined because major media outlets have been purchased by rich people who only allow the media to publish pro-conservative, pro-rich, talking points.
Healthcare is a larger stretch for their dark joke, but the governmental agency that sets the rules for healthcare research and what are the socially approved recommendations is run by RFK Jr. who is a well-known anti-vaxx guy, also the U.S has left WHO and may not get access to WHO data anymore, and last year the CEO of an insurance company got shot basically for denying insurance claims for healthcare, indicating some level of corruption. There may also be more dark joke levels in regards to healthcare if one is a female.
Accounting is also something of a stretch, but there are governmental shenanigans where common accounting practices are involved that indicate corruption and that might make you feel like "accounting, what a joke" /strawman quotes there
That, at any rate, is what I suppose can only be meant by the somewhat obtuse phrase dark joke in 2026.
On edit: no wait, CEO of United Healthcare got shot at the end of 2024.
