Circles.Life offers 50 GB Lifetime CIS plan at S$18/mth

It looks like Circles.Life the market is getting very competitive as MVNOs are offering higher data per month in their plans.

From now on, you can 50 GB of data + unlimited calls for just S$18/mth and it will continue till you terminate or port out the line.

It looks like, other MVNOs will also react accordingly. Currently, Giga is offering a pop up plan at $18 for 40 GB. Grid offers a $17.90 plan for 30 GB of data (for first 12 months).

I wonder why isn’t it offer to all users but to CIS only ?