In other words, you'd ban someone because they might notice that you are doing illegal stuff and you might get caught.

Follow the laws and it isn't an issue. I'm pretty sure banning someone for that stuff is probably illegal, too.

You would do no such thing, because if you tried, you wouldn't have a business in the EU anymore.

We don't want your business in the EU if this is your attitude to things like this.

Processing my personal data in such a way (to ban me from your services pre-emptively) would be a breach of the GDPR and in some member states could involve criminal sanctions.

For example, in the UK we have a very famous case (The Consulting Association (TCA)) where building contractors joined together to build a list of construction workers they didn't want to hire - this was determined as a criminal breach of UK data protection law.

So have at it, I love a challenge...

Frankly, this attitude is pathetic. Absolute loser behaviour.

I don't think you should be doing business anywhere if customers being familiar with the law and knowing their rights scares you. Frankly if you are running a business, you should be familiar with the laws and regulations, doing otherwise - especially when someone points out that your behaviour is illegal - is negligence and punishment with a fine is completely appropriate. Welcome to living in a society.

The risk of getting caught doing business illegally? You really don't give a damn about the illegal part, just getting caught?

You can see the fines the Bulgarian regulator has handed out here:

https://www.enforcementtracker.com/