Yes I'm involved with running those faucets - and with Mellow Ads too. There is no need for anyone to spend effort trying to prove this, I don't think it was ever a secret!
Just look at my forum post history and the ANN threads for Mellow Ads (https://bitcointalk.org/index.php?topic=1092698.0) and Bitcoin Zebra (https://bitcointalk.org/index.php?topic=565738.0)

I hardly want to even acknowledge the statement that we "don't pay people", as it's pretty offensive.
I'm pretty sure there are plenty of people that will vouch for our faucets being honest and paying consistently over the last couple of years.
And Mellow Ads pays out to all our publishers on demand - I'm sure there would be plenty of complaints in this thread if we didn't.

These are some of the current bitcoin hot wallets that we use for payouts/withdrawals, so you can easily see the outgoing transactions (that's the beauty of bitcoin and the open blockchain )

Mellow Ads: https://www.blocktrail.com/BTC/address/31wpB9weXg1u3yjLqbk4XHVkwQPKBkHxjZ (379 btc sent)
Bitcoin Zebra: https://www.blocktrail.com/BTC/address/3L6ucV5cpXmGgnoik5P7wwczvES9ezuLsL (186 btc sent)
Moon Bitcoin: https://www.blocktrail.com/BTC/address/38DPYmsa7RXwLrhpTP6udrfSiGn5dzdGAC (472 btc sent)
Bonus Bitcoin: https://www.blocktrail.com/BTC/address/1MoYyajsjhVJE5BfDviFF8UbuefziGeDJy (114 btc sent)

Thanks