When was the last time in history that people didn't use the most advanced technology to subdue/imprison/etc. other people?

I am not saying that good things didn't happen, but where there is money to be made, money WILL be made. And for some countries that don't enjoy regulations like GDPR (China, India, with growing economies 'solutions' like this will definitely come to play). Some people will replace a form of slavery with a newer form of slavery.

Intelligence implies belligerence

Quite literally never. Society and civilization, from the earliest days, has been a story of subjugation of a lower class by a higher class. Technology and force have enabled this.

How else could you compel a farmworking class to provide for other segments of the society?

I'm sure China and India will like GDPR if they can use paper money to purchase industrial products and natural resources from the EU and North America

China and GDPR is not a thing. China is building a social credit scoring system which is the very thing that GDPR wants to stop from ever being built (see Facebook, Stasi, Securitat in Romania, etc).

India.. don't get me started. There is no law in that land. Hasn't been one. Will not be one for the next thousand years. Let's not be graphic, let's just say that "caste system", "women's right" and leave it at that. GDPR requires rule of just (as from Justice) law. Caste system and rule of law are conflicting terms.

Many people, like the Luddites, saw through the con ages ago. But people will still parrot the lie that technology and automation (AI in the modern context) will free the working class to live lives of intellectual pursuit and leisure to this day, when the goal of both is the opposite.

> Luddites

A group who, contrary to popular belief, were not 'anti-technology'.

The fact they campaigned for unemployment support and re-training for workers displaced by the new technologies probably makes the Luddites amongst the most forward thinking and progressive people of the industrial revolution!