I don't think it's suddenly so bad, it's been progressively getting worse over years and the rate is accelerating. It's also no worse in Paris than London, and certainly no worse than any big city in the US.
The only difference is that this week it's been on social media and has turned into a frenzy (I think because one bug has been spotted on a train).
The UK bed bug expert also said in a BBC article that the difference is that in France they're talking about it. In the UK the same thing happens but it's kept quiet. (He warned people about bed bugs on the northern line years ago already).
I have been worried about bed bugs for years so I'm actually grateful that this is raising awareness at last!