no signin will not prevent bot. you need to make strong captcha to prevent bot. Bot can very fast create script to login to your site.
no need for signin or register! it is irritating!edit
A few questions:
Do signin systems prevent bots? If so, how to I create a signin system for my faucet? Willing to pay for help coding and implementing.
We can make a faucet script from scratch with register and login system for just $100. Pm me if you're interested.
ripper. signin system is very easy to make.