... and legal.

Recently Munich was hit by a snowstorm - that "recently" lines up with being on Air Canada 836 from Toronto to Munich.
As we approached the continent, the pilot informed us that we would be diverting to Paris for weather in Munich - after landing in Paris we were further informed Munich would be closed for the rest of the day.
So we got an evening in Paris.

As for the legality...from https://www.toureiffel.paris/en/news/history-and-culture/everything-you-need-know-about-eiffel-tower-night

Is it illegal to photograph the Tower at night?

Photographing the Eiffel Tower at night is not illegal at all. Any individual can take photos and share them on social networks.

But the situation is different for professionals.
The Eiffel Tower’s lighting and sparkling lights are protected by copyright, so professional use of images of the Eiffel Tower at night require prior authorization and may be subject to a fee. Professionals should therefore contact the Eiffel Tower's management company to learn about conditions for using the images depending on the case.