This tool is 100% Fake 
Making mass DM > Possible
Making mass GROUP JOIN > Possible
Creation and storing user sessions via web version possible uses local storage no cookies.
Creation automation? Only via VA, otherwise not possible.
Cost per created TG ACC? $0.1 or $0.05 per SMS verification so for $10 you can create approx. 100 or more ACC,
but it must be manual approx 5/3 min per creation, a browser login, and local storage export.
So for 1000 accs you will need to spend 5000 min in creating those and exporting browser session files.
5000/60 = 80h

Ok not too much, everything else can be automated.
The monthly cost of running 1000 accs would be $10 proxy and $5 server.
If you disable image loading, CSS load, etc and use the legacy version
https://web.telegram.org/?legacy=1Then requests would be very small kbs...
I already have proof of concept working.