My point isn't really about the implementation per se (I'm aware of the limitation since at least 2011 by reading then Link Prediction by De-anonymization: How We Won the Kaggle Social Network Challenge so more than a decade ago) but rather that the "solution" Murena offers is not a mandatory service. If people want to use it, they can. I do not want to, I do NOT have to. I'm not arguing that their solution is good, or bad, only that it's optional.