Because her Tappy app got like 100+ downloads on Google Play Store, and seems like no one use it at all (I tried it and there was like 1 inactive chat room for the whole Ho Chi Minh city area).
If someone pay 7 figure for an app no one use, the whole app developer community are all millionaires by now.
This is Tappy: https://play.google.com/store/apps/details?id=com.tappy.app&... - a location based chat app.
The tappy.co is redirected to weeby.co, which is the company she claimed to have bought Tappy for 7-figure sum.