They're clearly running a classic Ponzi scam. Luckily, you quickly realized the insidiousness of this business before fulfilling their final demands. I'm curious about the amount you lost. As everyone else has said, almost all cloud mining is a scam, especially those that offer fixed profit margins.
Yes, it is an old scam. They scammed you on your first deposit, and they will try to scam you again by depositing again. Real cloud mining is a thing of the past, but many people don't know that; they are misled by promises they read about scam cloud mining. These scammers do not have machines to run a mining operation; they only have scripts, fake photos, and videos.
If only people took a few minutes to do their research, they would find out that these so-called cloud mining schemes are actually Ponzi schemes.