a stock trading platform, as described in the article?
But it’s entirely possible for someone who calls themselves an engineer to not actually be a certified engineer. So the activity wouldn’t be regulated because the person isn’t part of a professional body that regulates members.
In that case, lack of competence would be a civil issue unless it resulted in something criminal.
not your job title, or piece of paper that you have that says you're X, Y or Z
It is still possible in the UK and I assume EU (chartered engineer and the EU-alternative).
So the reason it isn’t a PE-discipline is uptake, not the work itself.