Syria is about doing Israel's bidding , like Iraq was till it wasn't in GWOT aside from Afghanistan most $ was spent on fighting Israel's potential enemies.
The uprising in Syria was no more spontaneus than that in Libya . It was a regime change op and west+ GCC pushed a massive effort to overthrow Assad.Till Ukraine it was the world's most financed and supplied insurgency.
At present, US maintains a presence at Syrian oil and wheat fields , and All Tanf border crossing with Iraq and CESAR act is specifically designed to prevent a rebuild of Syria, its basically an extermination project . Also present are the French with a couple of illegal bases and air patrol of their own (Syria used to be French colony a they still think they deserve a say in what goes on there)
In the past, some might claim US is there for the Kurds given how much PR Kurds got at the time,if it wasn't for the fact that Turks a NATO ally have a pretty free hand to ethnically cleanse Northern Syria (Rojava) that was mostly Kurdish. and settle jihadis including AQ(the settlers were brought from Libya as well) in their place instead . Turkey is keeping an occupation force in Northern Syria to prevent Kurds living near their border.
To this day illegal occupation is still primarily about doing Israels bidding, limiting Iranian influence near Israel's borders and preventing resurgence of Syria as a nationstate. It has nothing to do with ISIS if anything they are likely being keept on life support to 'justfy' presence . Whatever is left of ISIS would have long ago been moped up by Syrians and their allies
These moderate beheaders even got an Oscar, and Holypedowood was fawning over them as much as they are over Zelensky , funny enough after the project wound down the British founder of the said group was suicided to tie up loose ends
Off course who could forget the last hospital that was front page news like weekly for a year or so . Who knew Syria had so many hospitals.