I have not run one licensed ATF in any of my vehicles.
2006 Trailblazer 4L60E. About 120,000km on Amsoil with Maxlife top up. Last 1k with Full Maxlife. 285k on clock and shifts as good as the day we got it.
2011 Ram 1500 with 545RFE. About 50k on Co-op multi vehicle synthetic ATF. I think it was 150k when traded in. Towed more than its weight rating for all the years we owned it. Never missed a beat.
2017 Ram 3500 6.7 with Aisin. As per manual, received pan drops every 48,000km and a filter at 100k. Has some sort of mix of OE, PetroCan Duradrive high viscosity, Maxlife Low viscosity and Co-op synthetic ATF. As above, not one issue and its earned its keep hauling heavy.
2004 Ford Escape with CD4E. Owned it since 227,000km and its around 235ish. Those 8k have been with a mix of Co-op synthetic ATF and its conventional Dex/Merc. No issues. Not sure if the fluid was original but it was well used.
The 2002 Pontiac Sunfire rez rocket with the 4 speed auto. Got it around 270,000km and i think its now 273? Those 3k are with Co-op conventional Dex/Merc. No issues. The fluid that came out looked original.
Had a 1993 GMC 1500 with 5.7 and 4L60E. It was maybe around 370,000km when we got it. The transmission begans slipping, along with torque converter shutter. Did a fluid exchange with Co-op conventional Dex/Merc. Cured it and it ran great for maybe 8000km before we sold it. That was years ago and its still daily driven by the new yet previous owner. The fluid that came out was unknown. It was nasty. Bloody nasty.
My BIL has a 1995 Jeep with the 4 cylinder and that 3 speed Aisin, I think? Unknown mileage but many years ago we did a fluid exchange with some conventional Motomaster Dex/Mer and fixed the cooling line. Still running fine all these years and no more gurgling fluid out during overheats.
What did I learn? Don't make things complicated and it's ok to save money by not getting ripped off by the dealer or licensed fluids.