I would say you are not the first, Xapo is giving away satoshi when opening a wallet, not the amount you suggest, there are tons of sites giving away bits and satoshis.
Your idea needs some more proof and being more trustworthy when asking for investors.
yes i seen Xapo and the amount i suggested can be lower baybe 0.001 BTC but high enough to worth something not just to increase the creation of wallets but also to engage people to spent ther BTC
most of the sites i found give away free BTC to people that already know about BTC and have wallets. My sugestion is to give them to people not involved yet with BTC
What do you suggest about proof? and how to make it more trustworthy? Maybe transparency between the BTC recived from investors and BTC sent away for free