im actually starting to wonder about what he did with all our IP's now...

I'm curious with your IP can do what?
I don't think the developer performed any IP clearing because the number would have reduced significantly to below 1000 addresses
The dev should really do ip clearing, because this number of addresses don't appear to be fair. Probably a lot of people have registered multiple addresses.
I think the form itself filters IP addresses.
Yes, it does.It stored your IP when you entered your ETH address.But, it can be bypassed by a proxy or VPN..so it's not a 100% safe method to do a fair distribution.If I was him, I would have added a email address too to be entered.