There are API services that let you identify the type of number provided by the user. VoIP lines don't identify the same way as landlines which don't identify the same way as actual SIM-backed mobiles. They blacklist lots of providers and number types.
My first account I was able to get was via a number I rented on dtmf.io. The account was suspended (across all "servers" in Discord) in a few minutes when I linked a few of my IRL friends in a Discord chat to that Discord article on my own website. I've not been able to sign up again since, despite having blown something like 40EUR on numbers from different countries/providers trying to get a new one.
Even when it works, it's at least 10 minutes of solving CAPTCHAs to log in, each and every time, and sometimes the Google CAPTCHA hits some other exit node rate limit and just tells you to fuck off entirely, making login impossible even with a working account.
My first account I was able to get was via a number I rented on dtmf.io. The account was suspended (across all "servers" in Discord) in a few minutes when I linked a few of my IRL friends in a Discord chat to that Discord article on my own website. I've not been able to sign up again since, despite having blown something like 40EUR on numbers from different countries/providers trying to get a new one.
Even when it works, it's at least 10 minutes of solving CAPTCHAs to log in, each and every time, and sometimes the Google CAPTCHA hits some other exit node rate limit and just tells you to fuck off entirely, making login impossible even with a working account.