from a friend: also in general when designing services keep in mind that russian market for renting phone numbers, captcha solvers, botnets and other resources for attacks is very developed. Spam attacks on Whatsapp a few years ago involved hundreds of thousands (if not millions) of fake numbers.
from a friend: also in general when designing services keep in mind that russian market for renting phone numbers, captcha solvers, botnets and other resources for attacks is very developed. Spam attacks on Whatsapp a few years ago involved hundreds of thousands (if not millions) of fake numbers.