afaik other messenger services arent save, as they are centralized or would have the possibility to store the data. dmme intends to do it rly safe, for example data wont be stored rather destroyed
...in app payments with coins are intended, and also you can easily participate as coinowner on future earnings-----all supposed to be real anonimus--so if it all works out, then this will be an awesome usecase/coin here imo!!!
App should be released soon(appstore;ios;desktop...afaik this row next months)