I'll say this once and most likely only once, so that people are clear on my views about this "account" vs "no account/anon" thing. Hopefully by the end you'll understand exactly where I'm coming from and why I chose this route.
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bots
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Yes, it will hinder bot progress a little bit. By the time they all adopt, it will be too late, though -- we'd already be stuck with a less convenient system :(
And you know full-well, it's basically a one-liner to setup a new email address (Or to do it in bulk and then just pick from the pool or whatever) with a proper lib. Every serious bot developer already has this in his toolkit.
Users don't understand "magic"
A lot of faucet owners think its easy for users to use a faucet "without knowing they are using faucetbox". They are worried about user adoption and adding more steps into the processes. I think this statement is false. With all the users I've come across with my faucets there's seen so many who contact me with these questions, and I'm sure I'm not the only faucet owner who deals with this.
"How do I make an account on faucetbox?"
"Can you send direct to my wallet, I don't have an account on faucetbox"
"I did a withdraw and my coins are not in my wallet its been 12 hours!!!"
"I made an account but my balance is 0 at faucetbox where are my coins!"
"I did a withdraw to faucetbox, but I dont have an account there??????"
That's actually completely true. I will adjust my stance on this point.
Users start out not understanding either system. They still need to get some education. Instead of learning some cool crypto ideas with FB; they'll just pick the same old "you need an account to do anything, it's like your bank" with FH.
Oh well.
OK, all that aside, can you please elaborate on:
1. Will users be able to reclaim their wallets using message signing?
2. What is the best migration path for referrals? Unless they all showup and get FH accounts, lots of satoshi are going to get stuck.
3. What do you think about PayPal model of doing things? (You don't need an account to receive payments, but you DO need one if you ever want to withdraw them). In other words, removing error 456, while leaving everything else as is?
FaucetHub is going to be a faucet itself, in a direct competition with faucet owners it aims to help. Like cattle to the slaughter, and people are cheering ;)