I can’t stand most layouts that put bright text on dark backgrounds, so I don’t use dark mode.
I’ve certainly noticed over recent years that most sites now use some approximation of black text on a white background. I find it (relatively) boring and samey but, more to the point, I’d just like to get away from the “printed page” metaphor. So, I’m generally guilty of using light coloured text on a darker background. I hope that people don’t find it hard to read but I think that font weight, line length and line height make more of a difference to readability. And there’s always Reader View.