scam.
its obvious because they keep telling you that you can only with draw the "principle" amount at any time.
thats the buzzword all scammers use to try keeping people from withdrawing.
because if they can only withdraw their initial deposit before the time is up the dummies think they are losing out on the magical vapour profit that the made up balances are fakingly showing, beleiving the fake profit balances are real. so they keep the funds in, purely to keep hoping to one day be able to withdraw the principle and the profit.
but guess what folks there is no profit. its a ponzi. any profit balance you see on a website is just fake balance saved on a database, and not real bitcoins with your name on it.
even their companies registration is to a postbox/rental space. meaning if you tried meeting them to slap them with a wet fish.. you wont find them.
even read the disclaimer:
BitROI Limited delivered the service right after the payment has made and member agrees that no refund will be issued due to the natural of business model. All transactions are final and no refund will be accepted. In case of dispute, special negotiation will be performing between the company and client.
in short. as soon as you hand over the money you have paid them for a service and the service has been delivered and finalised. there is no on going contract. your ties to them end as soon as you give them the funds.