This is something that would probably step on more toes than you think. There's a lot of people who make basic mistakes, and on the internet where anyone can be faceless, how many people do you think would use the dyslexia card to change their name? There's a lot of people who will/do use disabilities as a way to get an easier treatment on something, or even free.

Online, how are you gonna be able to confirm with a big busy corporation that you have dyslexia?

If they put a rule for something like that in, how many people do you think might try to say they have it just to get something free?

People need to be held accountable for whatever they do, even if it was a mistake. I have a friend who changed his name in game for RP reasons, but had to change it a second time because he forgot an apostrophe in his character's last name. Everyone has to be treated at the exact same level with no one getting special treatment.

I have multiple disabilities, that I won't delve into here, and I don't want to be treated like some special case, like you said, I didn't choose for my mind to be the way it is. But you're a person, so you'll get treated normally like everyone else does.