The "99% A, 1% B" meme is generally meant to mean that it's either/or (i.e. no multiple button hits), so if you hit option B and didn't already have gender dysphoria you just become dysphoric with no money and even worse healthcare...

Why is it assumed that you'd have dysphoria in such a scenario?

It doesn't, this is based on one specific person's (OOP) gender. It's more about how having a bajillion dollars makes gender dysphoria into an incredibly easy problem to solve.

The Obottom surgery, they call it

They might be saying: what if the button changes your external sex characteristics AND your internal relationship with gender

Which seems entirely not a problem

I wonder how many people would just go "eh, whatever" if this happened to them, especially considering all the disadvantages of being a woman in today's world. Plus if their mind stays constant enough that becoming dysphoric is a possibility, they'd have to deal with suddenly being a different sexuality. All in all it seems pretty traumatic if it wasn't something you wanted.

TBH being a woman in today's world seems like a pretty bad deal.

You know what, fair lol. Though its pretty fucking awful to trans women too.

Indeed, very confusing usage of memes. Same with POV.

Yeah, “oh no I'm incredibly wealthy and have no other problems as a result except now I probably need new clothing which I can afford” kinda a no brainer.

Plus it would be at least interesting to have both (major) gender experiences as a cis person. Could answer a lot of subjective questions. Might even get famous about it if you can prove it through DNA or something.

"You can keep your gender if you want it"

I assume the button 1% would turn you into opposite gender/sex/whatever, and you spam it till you hit twice the 1%?