SteemIt screenshot from SteemIt (I don't know if I still have to put this)
I know I could use a burner number and an anonymous e-mail address, but they would either require payment (or identity verification, which instantly defeats the purpose), or be provided for free but not guaranteed to work.
Nevermind that, I still won't join Steem (just to prevent anybody from impersonating me there).
Even if I am given the option to join there without providing an e-mail address or phone number and somebody convinced me to register there (just to prevent impersonation), I still would use the Tor browser, because my IP address is enough personal information for the owner of the now-centralized Steemit to provide a "free" account to me.