Quoted By:
>30k+ on 30 days from Holos
Out of the sub 1M only Kaela and Koyori are at that range.
A case could be made that, after the debut rush, lots of people subscribe during streams and having a constant presence in front of the audience helps building up interest.
There are counter examples of course: Aruran being the most remarkable but when other factors are added
>tagging along with the heavy hitters
>doing something memorable to attract interest
it shows that maybe it is possible to create a strategy to incline subs without counting on luck, exceptional talent or virality