alt Hacker NewsThe Taliban did not "win" their insurgency.
The US decided to leave because staying was not politically popular, and left. They were not beaten by the Taliban, they were beaten by the political climate at home.
If someone is actively kicking your ass, then they decide that you aren't worth the effort to keep hurting and decide to walk away, that doesn't mean you "won" the fight even if you get what you want afterwards.
The Taliban control what they and the US and allies fought for. That's winning. Your personal requirement of how it must be won is not important - nobody cares how it was done and it doesn't change the outcome. The Taliban don't care and the US and its allies don't care.
It's also a perfectly common, expected way to win a war: First, wars always end with political solutions. The most well known principle of warfare is that it is 'politics conducted by other means' (i.e., by violence rather than by law or diplomacy). If there is no political solution, the war never ends. That's why the US didn't win the war in Afghanistan after decades - they couldn't create a stable political solution because they were unable to impose one on the Taliban, who in the end imposed one on the US and its allies.
Victory by outlasting enemy resources, including political will, is fundamental to warfare; wars end when resources to fight (for the political outcome) run out, but few end in total kinetic destruction of those resources - someone runs out of money or political will. It's also the explicit strategy of insurgencies. Enemies of the US know it very well and have used it for generations - that is how North Vietnam won, for example. When the Soviets invaded Afghanistan, the Afghans famously told them, 'you have the clocks (the technology), we have the time'.