I think it's not a problem the same as usual when you open the wallet to send BTC, of course you have automatic login to email
if you do it this way you save 0.007BTC as each participant had to make 70 the minimum bet 0.0001 x 70 = 0.007

yes you save txs fee, but trust me

in some situations/events you prefer to bet from your wallet
Yes maybe, but so far I do not have a problem and hope it never happens
registration started? and where should I enroll?
The committee held a competition will soon be made Check back tomorrow, usually the registration will be here (gambling thread) so wait here and wait for the next instruction