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Paying for a service; not free.
umm Dailybitcoins and Coinads isn't free then ? as an advertiser you pay for impressions or pay for people to visit your site to win prizes ?
It does not matter, I feel, who is giving the bitcoins away but whether the receiver is asked to actively do something to get them.
Being exposed to advertising by going to their sites I do not feel is too much to ask... others may disagree and may not feel it is worth
it. They can choose to leave the site right away.