What you are describing, with the small daily earnings and then buying more "rigs" within the platform, sounds exactly like a lot of those old cloud mining scams. Then it is probably already closed because the vast majority of them were scams. These sites were popular in the past, but if you cant find out more details, it is hard to figure out which one it was. The fact you cant remember the site name or much about the "rigs" themselves is a strong indicator that it was one of those short-lived, fly-by-night operations. They pop up, promise easy money, get enough people in, and then vanish with everyones deposits.