BTC and ETH have fees and are much slower than NANO. So it won't be able to support the same microtransactions and automatic cashouts. Thanks for the advice on the copper membership. I'll have a look at that.

Surveys are what they are. If you haven't been credited then you didn't complete it to the advertiser's satisfaction. Clicks are being tracked from the site. There's no need to refresh the page. The bonus will come through and update without you doing anything. My advice is to click the links in any emails sent to you.

You may also consider the twitter giveaway for an easy bonus.