In the Bitcoin mining industry, Bitcoin is characterized by passive (or equivalent) income. These scams usually require you to deposit money before buying a Bitcoin mining contract. In return you get a guaranteed income, or so they say.
The fall in cryptocurrencies gained popularity as the price of Bitcoin jumped. When many new and unreliable people join the business, they often come across these fake companies. It is up to you to protect yourself and decide whether it is a scam or not. Because bitcoin exchanges are not reversible, few services are available to victims of these scams.