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It's legal, they just won't pay you subsidies for solar panels.

If and how panels are incentivized varies from country to country.

This is one of those laws that you should want to break. I’d rather have energy independence than follow rules.

I've always wondered, what if you were to wire up a panel and one light to the grid, but the then rest of the house is on a separate independent circuit? Technically the house is on-grid...

You could get caught if ever there's a fire, or you need an electrician and you forget to undo that before the electrician gets there, or if there's some sort of code inspection.

I don't think it's that simple. These circuits are already a thing in the form of solar powered security lights, and shed lighting kits.

I suspect the dividing line is voltage? >50v systems in cars are treated differently, so maybe the same for houses, you probably don't need that much for lighting anyway.