The EU still wants to scan your private messages and photos

https://fightchatcontrol.eu/?foo=bar

Fight Chat Control - Protect Digital Privacy in the EU

Learn about the EU Chat Control proposal and contact your representatives to protect digital privacy and encryption.

If you're ever unsure about whether a proposed EU regulation may be good or bad, just look at whether Hungary supports it: if so, it's bad; if not, it might be good. Egészségére!
I'm Polish and I was positivity shocked that we oppose it. I remember attending some protests against ACTA which as far as I remember was supposed to be something similar, back in my student days. It was -17°C and people still showed up. Apparently we have some culture of opposing censorship and invigilation by state. May come in handy if the democratic decline keeps progressing...
Do you mean "surveillance" by the word "invigilation" here?

Could be a wordplay due to the fact "invigilation" can be translated to and from the Polish word with a _very_ heavy and long connotations to the USSR state surveillance, oppression and abuse.

Surveillance would be a more "modern" (even if more natural or seemingly correct word), without this sort of the implied baggage.

There a practical reason for this? like more alignment with lobbyists, for whatever financial reasons?

Over the last two decades Hungary reversed course from a democracy joining the west to an authoritarian dictatorship in bed with the Russians.

Hence, everything their government does is the opposite of what a typical European Union member would approve of.

I wonder what it would take to expel them from the EU...

It's simply not possible. EU law has no provisions for kicking a malignant country out. It was simply not foreseen. They can only decide to leave themselves. Which orban will never do because his oligarchs make billions off EU subsidies.

If it were it would have happened already.

Hungary is governed by a Russia aligned autocrat. This generally does not align with the priorities of the rest of the EU.
Orban is an evil politician, and Fidez is an evil party.
Orban is a Putin asset.