DSA and DMA is widely known, but perhaps not by their acronyms or every individual rule.
I don't know in what country you live, but this was not exactly some hidden issue, in almost all member states this was a local issue and had local news coverage as well.
The only way someone would not have been aware is if they spent none of their time on any local or global reports. But in those cases, everything is going to be something they are unaware of and we'd be talking about people who are essentially disconnecting themselves from society. Everyone else would have heard about it multiple times since even local elections made a point of mentioning it, and election turnout is high, even if you don't participate yourself for some reason, it would be really hard to not have talked to anyone who did.
