By what principle is the choice between singular and plural when specifying a tag?

Question

Habr

Kind of a recursive question :-) Note no tags to this question. All specified tags already existed in the database.
The link habrahabr.ru/search/?q= [tag] contains 7 topics, the link habrahabr.ru/search/?q= [tags] contains 88 topics and 7 questions. Somehow, intuitively, I foresaw that the tag "tags" would be more popular, although an equally intuitive sense of correctness requires me (apart from the fact that it is correct (from the point of view of the practical advantage of choosing) in such cases just what is generally accepted ) from the two options, choose the singular of the nominative case (or the imperfect infinitive when a verb is used).
I don’t remember right away, but as far as I remember, it is possible to find reverse examples: when the majority chooses (and this can be similarly clearly foreseen in advance) a single number.
Attention to the question: what determines this de facto and how it is actually correct (it seems there was a whole theory on the topic of tags - I read it once, but I already forgot what it is called).

Answer 1

> By what principle the choice is made
Math.random ()