Is 4.00% an annual rate?
Yes it is annual.
Since the founds are not used for any purposes that would generate profit why are you doing this? Out of the goodness of your heart just to make your users enable 2fA?
There are actually 3 reasons why we have added this.
1) users use bad password, prefer an URL based account and so on. It is always bad when such an account is hacked, both for the user and for the site. We cannot force users to use 2FA but we can give them a reason to do this.
Note: a lot of our users use those URL based accounts, while most probably have a few browser extensions that can access those URLs. This is a time bomb ticking that can be countered by 2FA.
2) We had customers complaining that they get some interest at mcxnow. Well, we did the math and figured that it will not really cost that much.
3) There are certain gambling behaviors that could potentially generate more profit for the site as a result of this. We hope that because of this the net result of paying interest could become a profit for the site - time will tell.
The longer you have some funds on site the more often you will earn interest.
Above that you menioned that the interest is paid every 4 hours. How does that make sense?
Well, since only a small portion of those 4% is paid every 4 hours, you wont reach the whole 4% if you withdraw after a short time.