I guess it depends how far they wanted to go to investigate you. Theoretically they could try to find your social media history, etc.

Apparently you can get in trouble for lying on those questionnaires

What websites do you notice a lot of Spanish people using?

Can you please share what they are

Instead of self-hosting, I have a device that can hold a large amount of sideloaded material and sync between my PC and device with syncthing. Boox devices work well for this.

Exactly. And they will be highly educated and bring new ideas to the revolution.