I'm a bit worried about this and what can we do to mitigate this problem?
Another problem is that this data will eventually get leaked (see quora today https://news.ycombinator.com/item?id=18594564 ), so your real identity will be linked to everything you do online forever.
Why is it bad? You might lose a job, you might get lower credit score or you might even get more limited in life (can't buy flights, high-speed trains, hotels or travel freely...) ... just because you posted something that is not conventional or similar.