So basically, you used to be able to just turn off bixby and this wasn't an issue.
Then they patched that. Then you were able to use third party button mappers to get rid of it, but they patched that too.
The deal is, basically, Samsung is going to great lengths to force people to use services they don't want to use to collect data. It's really too bad.
After paying for software and trying to override bixby, exhausting the settings options, I gave up.
I fixed it by prying out my entire volume assembly with a screwdriver. This may have been stupid, and I totally might have missed an actual fix, but I spent weeks on this, and the only working solution I've found to fix bixby, is to physically smash it out of existence.
My phone no longer is waterproof, and I no longer have volume controls, but the battery lasts more than a couple hours, so lesser of two evils I guess.
Samsung has the best hardware at the best price point, and has consistently made the best phones on the market for a number of years, but ultimately, I can't recommend buying a Samsung product to anyone, because the bloat ware is so awful, invasive, and literally phone breaking in ways it has no reason or right to be.
So sorry for the long, and ultimately probably unhelpful response, but I hope Samsung starts to backtrack on some of this. My experiences on phones like a g5 which comes with clean, stock Android out of the box have been infinitely better, and a lot cheaper.
Volume controls and no longer being able to have a button mapping for flashlight suck, but I can reseal the phone for waterproofing, and I do have a useable battery life. So screaming at bixby while smashing out parts of your phone is a semi valid solution, and honestly, the only one I was able to find after a lot of work.
Sorry, and good luck. Not buying anything by Samsung again personally, at least until they quit with these business oriented practices to try to control and limit their end users. Some real apple *****.
