Well TronDark should be a scam dapp.
Now their Daily ROI contract is empty - https://tronscan.org/#/contract/TAYA4AWxE2G9UNgQBsH96gm8VC8VU7wXqF
Devs also blocked the chat on their discord channel.
I saw also screenshots which proved the dev is the same who did exit scam before with dapp Dividends3d