The bank of Tron

Ok so I found this TRX and BTT interest dapp on the tron network. Well first I deposited couple hundred BTT. Just watched it gain 3.7% for a few days. I decided to drop about 50k BTT. Waited a week to withdraw it. The contract comes back revoked and nothing happens other than losing 2.5 TRX. So I checked the contract wallet. Just a few shitcoins and a small amount of BTT, TRX. So clearly it's a scam and my money got donated to the scammers wallet. Lesson learned? Always,Always DYOR into the contracts. Before dumping crypto on the market