That shares module mean you are shareholder. If you own shares you earn 7% of website profit. If up-BTC has not profit ( only from fee) in one...two...three days you do not earn. And this profit splits to all shareholders. Payout are daily only if the website recive profit from fees.
Is this clear for you?
Do you still have that share but you earn when up-btc make profit from:
-add fund fees
-withdraw fees

I change the withdraw limit because if somebody want to withdraw 0.2 after fees remain almost nothing.
0.5$ will remain as withdraw limit