I suppose it might serve as a useful warning for readers from other countries, especially if their country doesn't have tabloids of their own. I would say most people in the UK know to take news from certain publications with a grain of salt, but it can be far from obvious for others.
There are no countries where there are media, but no "tabloids" (also the term can be different). The UK is not that unique as you seem to believe.
All countries have vulgar media, but generally they print personal stories only after there have been charges pressed, or someone got sued.