Toum is a valid condiment and is naturally vegan. To make mayo vegan you need to do weird things with unpalatable/indigestible waste products. But mayo isn't a very good sauce anyway.
It's an untreated byproduct that you normally discard. Every culture that eats beans has discarded their bean rinse water; you don't really see recipes that have you cook the beans in their own rinse. Canned beans have been a thing for a century or more but there's a good reason why bean wastewater was only "discovered" by some random guy 10 years ago.
Saponins and other stuff in there are cool for industrial processes but you don't really want to ingest them.
Every culture that eats beans has discarded their bean rinse water
Because there hasn't been a need to create an egg substitute that produces recipes that traditionally just used egg.
you don't really see recipes that have you cook the beans in their own rinse
I thought the soak rinse was always discarded, the aquafaba is from the cooking water (either in a can or the pot it's boiled in)
You can taste saponins, a quick google search suggests that there are definitely some people making extremely bitter aquafaba (i.e. likely with a high saponin quantity) but that's not supposed to be the outcome.
Saponins and long chained sugars that people pay a lot of money to put on their skin? I feel like I did read something once about it not actually being from the saponin content but I might be making that up
Anyway saponins are in a lot of things, if it's not bitter I reckon it's fine.
you wanna use a food processor or a stick blender in my experience. also add some mustard to help it emulsify. most recipes are a slight variation on this one:
I think that would be acting as an emulsifier and thickener. I haven't made vegan mayo with it. I think the ingredients that I do use that would serve those roles are soy milk or a little starch.
Hidden Valley makes a plant-based ranch, if you wanna go that route. The vegan mayo I use is from a brand called Best Foods. I think it's just a regional rebranding of another mayo. It's ok but if you are recently coming over to the vegan lifestyle, it is noticeably off from real may. It works well as a spread of for an ingredient for a sauce though. I have a non-vegan friend that was raw dogging her chicken nuggets with it though so ymmv.