Let me show you why Catly staking is sustainable:
You deposit $100 ×250= 25,000 catly
You earn $90 which is 90x250=22,500 catly.
Now you decide to stop and sell
You sell you 25,000 catly @ 0.003 which is 25000×0.003=$75
And 22 500 catly ×0.003=$67.5
Total withdraw 75+67.5=$142.5
Your $100 deposit -$67.5 earn =$42.5
You actually earn $42.5 and not $90
I think $42.5 in crypto world is sustainable.
That is 1.4% daily earning which is average what Defi and other stakings pay
If they are using the money for trading is sustainable because they are giving net 1.4% daily which is sustainable.
The site is still working perfectly.
If they use $100 well in a month trading and arbitrage , they should be able to make $180 or double it in 30 days using bots and AI.
Even me myself without using bot or AI and without normal trading earn average 3 to 5 % daily on my potfolio. That is 90% to 150% monthly.
All the best