So I guess it's illegal to have a BTC full node... I wonder why the authorities have done nothing about it.
It's because you can't easily access an illegal JPEG from pre-Ordinals days from the blockchain.
They go after those who identify and share the blocks where this content is located, and teach how to access it.
With Ordinals, things can become a little different. Because access is easier and the quantity can also be much higher. That's why this issue of Ordinals is more than simply using the network freely.
Anyway... we're already doing a lot of offtopic.