I would also point out that the rebel groups are basically backed by Turkey, SNA is virulently anti kurd, there is a turkey backed group made up for central asians, afghans, pakistanis etc etc -they seem to hate everyone who isn’t one of them, HTS is backed by turkey but Jolani their leader has a streak of not liking being told what to do by supra national bodies (he’s got a target on his back from Isis, distanced himself from Al-Qaeda) so I wonder if he manages to wrest control of Syria how long Turkey’s influence will really last.
It is actually a bit insane how often people manage to blame Israel. All their activities in Syria have been about eroding weapons supply or ability to attack Israel. They are probably not pro anyone in Syria except possibly the kurds, druze and other minority groups who pose no threat to them.
I would also point out that Israel has a population of just under 10 million people and does not have limitless funds to be funding jihadi groups all over the middle east. Funding comes primarily from donors and criminal activity and in the case of Al-qaeda gold mines in Afghanistan. Hamas has property investments in turkey for example.
Right now it’s a fight between Turkey and Iran. Those are the proxies backers. This has little to do with the USA or Israel except for tangentially where they have pursued their own interests.