There are those who use a Telegram account. Singer J Balvin took it a step further and gave WhatsApp to his audience (millions of people). And it is very well thought out, 1 You acquire a new phone number. 2 you give that phone to your audience so they can send you stuff 3 you make a WhatsApp group with all of them. 4 now you don't only have their email, you have their phone numbers.