I agree with you, the possibility of addiction in trading is very low, because there is no material to get addicted to trading, trading runs on the power of skill, so if you work with emotion here, you will not get anything but loss as a result. You have to learn more from the loss in trading, and you have to avoid making that mistake in the next trade, this is the main point of trading. And if we want to talk about addiction, then in that case addiction is the only place where people can achieve big wins without any kind of knowledge, skill, research, that means gambling, but there the possibility of getting big wins is 10%, and the possibility of losing is 90%, and this is why people are addicted to gambling most of the time, but trading is not an addictive thing.
A trader can be addicted to trading, There are also factors that make a trader to be addicted to trading, for example emotions, greed, invalidate or poor decision making and so on. But People hardly get addicted to trading not unlike gambling. And this is due to some procedures or steps that are followed before you could start trading for example being knowledgeable about the basics of trading, commitment, discipline, patient, consistency, and proper management and so on. Those are the factors that contribute greatly to a successful trading and also make someone to be a responsible trader. When a trader set a positive mindset and clear goals nothing will ever stop him from moving forward.
I don't have a believe that a non profitable trader can be so addictive to trading looking at how frequently they are making loses and the pressure to reduce it by all means even when they try as much to chase their loses. Trading is a different skill all together is it's not always profitable for us until we know what we are doing and reduce the potential of making loses in the market. Every trader must be prepared to face whatsoever happens in the market without panicking or trying to do too much. As a trader that has been in the market for a while trading can be addictive but not for those that are not profitable in the market.