well in general most of such sites are scams , but you need to be super carefull with such thing popin ups
no site will give you free money or free power unless it's planning to scam soon or in order to keep money coming in (ponzi)
Actually what scam is this, they are giving you for 60 USD shipping S5 miner which is heavily unprofitable to use, so they are not doing you a favor at all, only if you have free electricity or you steal it, S5 is totally worthless nowadays so they want to take advantage and selling them since they are the GHS2.0 there which are not working anymore and give it to noobs. The site is still working, although we have said it already it may end in a scam with high probability, but in this case nothing is suspicious to me. No one buy the S5 nowadays as it is totally unprofitable.
So be smart and don't pay 60 USD shipping for a non working product, even if them may ship it to you for real.