From the universe.

You stole people's money and called them donations. You are acting irresponsible and unethical. You are scammers.

No. It isn't. The only content on the "main page" is "Bets from 0.01 to 0.3 BTC". It doesn't say anything about seizing (donating) of funds, nor does it provide a warning before betting.

Not even mentioning the text is small on some browsers and may not be visible to everyone.

So return the amount of Bitcoin accidentally sent by users who did not see the small notice.

This is a standard ethical approach for companies; one which you are not following. You specified before that you would return the funds, and now you have changed your mind.

The above messages sent by yourself should be a sign to all users... not to use UpDown.BT

im trying play in updown.bt in this frist time for me..
i dont know about minimal bet 0.01
i send 0.004, cant you return my bets..

To say something like "I'm sorry but I get too many bets under .01 BTC so I have to keep it, and I'll donate it to charity" would be a lot better than "tough **** I'm keeping it and saying you donated it to me."

Updown is sketchy, PERIOD, especially after the sig campaign stuff they tried to pull.

I usually don't gamble like this but i saw it on the blockchain today and thought id give it a try. I like the site its fresh, simple and cool.

I looked at the whole site in under 2 minutes and fully understood the minimum bet and maximum and how to bet on a binary option.
I did bet on AUD rising so i set .1btc it was placed the instant i sent it and i could see it tracked on their website. As a bonus i won .175 and it was in my BTC account within the normal 10 block confirmation time i guess.

That seems normal to me so they can confirm it was not a fraudulent bet but as they say it does not disrupt actually placing the bet and it was all very streamline. So good luck to the devs and warning to noobs, read the site and understand what it is you are doing before you send money anywhere and your life will be much more pleasant!

NOTE TO OP: change the "payouts in 60 seconds" on this thread please it is misleading, i can however understand why you havent been back here with some of the tardness that has drenched the thread!

Donations was used the right way — service got an improvement and now all the bets that are below minimal will be returned with miner's fee deducted.

I'll be looking forward to it.
https://blockchain.info/tx/7821d454e987a359c26b548141e6687ea66b94dc13795b1a73ccfc8aff29e0da