It's the Indian English convention for placing commas in numbers -- one comma after the first three digits, then one comma after every two digits thereafter. e.g.

1,23,45,67,890.

It looks like the website is based in India.

Instead of the ones(10^0)-thousands(10^3)-millions(10^6)-billions(10^9)-... system followed in most other parts of the world, the Indian numbering system uses ones(10^0)-thousands(10^3)-lakhs(10^5)-crores(10^7)-...

So, for example, half a million subscribers (500,000) would translate to 5 lakh subscribers (5,00,000).

Seems to be using the Indian numbering system:

https://en.wikipedia.org/wiki/Indian_numbering_system