> I don't know a process for becoming the one with the largest userbase.
Easy: Be at the right spot in the right time and be lucky to be noticed.
WhatsApp had one smart idea: tying accounts to phone number, which solved detectability, while SMS where expensive in many regions. When ICQ/AIM still missed the mobile market and before Apple made iMessage.
Easy to replicate, as we can see with Facebook messenger or Google's different attempts, who invested quite a few resources into that.
Easy: Be at the right spot in the right time and be lucky to be noticed.
WhatsApp had one smart idea: tying accounts to phone number, which solved detectability, while SMS where expensive in many regions. When ICQ/AIM still missed the mobile market and before Apple made iMessage.
Easy to replicate, as we can see with Facebook messenger or Google's different attempts, who invested quite a few resources into that.