IMO it's morally wrong. It looks like I'm the odd man out on this one but it's still my opinion. I'm not bashing you, I just don't agree with it and wouldn't do it myself.
What part do you think is morally wrong?
a) telling others about byteball
b) helping them claim it by taking on some of the work (installing the wallet, talking to the transition bot)
c) charging a fee
I suspect that you're fine with the first two and just don't like to see someone charging for a service they are providing. I don't see how charging for a service is immoral either, so maybe it's actually the second one you have the problem with. I really don't know though.
Curiously enough I offered the same service to the users of my dice site yesterday, but didn't take a fee. Is that still immoral?
What is immoral is the byteball dev clearly wants you to sign an address from your bitcoin address, not have other people sign their addresses. It makes their distribution model broken just like how people complain the Chinese took over bitcoin mining. I don't care about him telling people about byteball, helping them claim it, or charging a fee. Also, we know he wasn't doing this to help th claim it. It wasn't a service he was offering, it was a way for him to make money. It's immoral in regards to the byteball distribution model and indirectly everyone's byteball is now worth just a little bit less. Also, did they know their addresses could never be used in byteball airdrops in the future? Who knows.
Also, this just seems like those shady places that cash your cheque because they know you can't use a bank and charge you through the nose for it. This is exactly what cryptocurrency is supposed to be against. Trust no one and distribute money fairly.