We can do some quick estimates to compare (using a 3090 because I helped a friend do a bit of mining on theirs and I know what figures are plausible):

First some variables:

  RTX3090 idle power usage   = 21  Watts
  RTX3090 mining power usage = 270 Watts
  RTX3090 gaming power usage = 350 Watts

Mining energy usage:

  270W \* 24H = 6.48 kWH per day

Gaming energy usage:

  (low, 1  hour  per day)  350W \* 1H + 21W \* 23H = 0.37 kWH per day
  (med, 4  hours per day)  350W \* 4H + 21W \* 20H = 1.82 kWH per day
  (hig, 8  hours per day)  350W \* 8H + 21W \* 16H = 3.14 kWH per day
  (ext, 18 hours per day)  350W \* 18H + 21W \* 6H = 6.43 kWH per day

So even with someone who I'd consider a high volume gamer (8 hours per day) uses less than half the energy of running a miner for a day. You'd have to game for over 18 hours per day to use more energy than a miner. Of course both the gamer and the miner end up using a chunk of metal and plastic that will end up in a landfill so that bit counts the same.

Note: From what general figures I've seen online the energy works out roughly the same for the rest of the recent RTX series cards (some such as the 3060Ti work out a few % more favourable for mining as they are more energy efficient overall)