Yes, most of the cloud mining are based on the daily interest and weekly interest. As long as they are getting investment from people we are in safe hands and once the interest is stopped we have to face many challenges and there is no guarantee whether we are receiving our investment back. So we have to be very careful when dealing with this cloud mining websites.
It doesnt matter even if they are based on a weekly or daily interest , most of them are still scam that is why i would not recomend anyone to try these so called cloud mining sites . Instead youd better go on to something thats real profitable like investing or trading. But if you really wanted to do mining as a long term hobby then much better if you can just buy a real mining hardware in order to see the best possible results.