You can have it seems a text to any number to verify so even a dumb mobile phone would work. Though I totally agree linking an IM account with a mobile number

You can have it seems a text to any number to verify so even a dumb mobile phone would work. Though I totally agree linking an IM account with a mobile number is bad. There's benefits too like discoverability and ease of use but I prefer something where I could be anonymous and have multiple accounts.