I think it's more exact to say something like this "Bitsum will change my wallet". It always be true, lol. There are lots of miners who mined more than 3 millions SUM (at rate before the swap), so it's not strange if Murbizia really had over 3 mils coins.
Several months after launch, we have seen very little developments from Bitsum devs, so currently it's hard to say about potential of Bitsum project. We need more works for its dev and they should demonstrate their abilities to keep the project works well.

However, I highly appreciate them for creating the first cryptocurrency which operates on telegram platform.