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I would like to ask everyone if this method is feasible and if there are any risks?

Traders operate trades using sub-accounts, and clients sign agreements with traders, such as returning the principal after one year. During this period, regardless of profits or losses, the trader charges the client a fee of 8 points per month. When the sub-account funds fall below 80%, the trader will independently replenish the agreed principal, which has nothing to do with the client.

Is this approach feasible? I just started dealing with cryptocurrencies, and someone recommended this way of playing; I would appreciate it if everyone could help analyze this, thank you!!