According to the Steam Hardware Survey (which you can view for yourself at <https://store.steampowered.com/hwsurvey/Steam-Hardware-Softw...>), the RTX 3090 makes up less than 0.48% of all video cards in use by gamers. The 450W power figure is for the new RTX 4090, which will no doubt take a while to reach even that level.
It might be nice to have more information than that, but it honestly doesn’t seem like a huge problem. Your fridge probably costs you more over a year than even a 4090. See also air conditioning.
Power grids are not buckling everywhere. Also this card uses less than a third of a single space heater. Finally, this card has not been released yet, so it isn't causing anything.
