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But I know that some people are surrendering their devices to mine bitcoin due to high expenses that's why they invested to it instead of mining it.
High mining costs in 2020 are indeed a reason for some miners to sell their mining equipment.
The former RIG Miner was able to make some profits, but after the halving occurred and bitcoin prices soared, the RIG was no longer profitable and tended to be more disadvantageous.
The price of a RIG device such as a VGA card also depends on the price of bitcoin, if bitcoin is more expensive then the device will also be more expensive.
Like it or not, if you want to keep getting profit, you have to upgrade RIG to the latest device at this time. Like the ANTMINER mining device, which recently released the latest version as well.
and the main problem also exists in the use of electric power which is increasing and will make the bill increase.