I asked this question in the Telegram channel but didn't get a satisfactory response. Perhaps someone here can answer my questions.

I was told that miners are only allowed to mine BTC, ETH and LTC with Slush Pool and Litecoin Pool. Furthermore, miners are aggregated into Giga Watt's account at each of these pools, i.e. miners don't have individual accounts at these pools. (Please correct me if I'm wrong.) This obviously needs some serious auditing. How do miners know they are receiving what they should be receiving? Why aren't miners allowed to have own separate accounts with these mining pools?