I don’t think they will close anytime soon, but you never know offcourse. If you have invested in the premium membership by buying some FUN tokens, than I think your ROI is about 1-2 years. Been a while since I last did some calculations, but if you take everything into account, your ROI is pretty fast.
1-2 years? The interest rate on their investment without premium is 4.08% and with premium is 5.1-ish that means a minimum of 25years or 20years respectively to turn 1BTC to 2BTC. Where are you getting 1-2years from?
Of course I want them to run for longer than that. We should dwell on the negative and keep our vision on the positives. Since the site has a solid business model of brining in money and paying out money, they should sustain long enough for all of us to ROI and profit beyond that.
You are each referring to different investments. Investing in the premium membership by buying tokens, reaching 100% ROI should be much quicker in theory. For me it's been nearly three years and I'm still not breaking even due to FUN token's loss in value.
Investing BTC to earn daily interest, you are already breaking even on day1 because your 1 BTC investment is still worth 1 BTC. To reach 100% ROI, and doubling your BTC it should be sooner than 25 years even if you aren't a premium member, never make any deposits and never earn any sats from other sources like the faucet and WOF. This is because your interest is compounded daily and over time you earn more each day. According to an online compound interest calculator, it should be about 17 years with a 4.08% annual rate and 14 years with a 5.1% rate.