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Telegram starts to look like a super app, echoing WeChat
(techcrunch.com)
This is a most excellent place for technology news and articles.
If unofficial app can MITM registration, it can the same way MITM login later.
And browser version of Telegram does not allow registering new accounts also.
Compared to login, MITM on registration means the culprit knows the IP address and the time of the registration, which is usually significant on claiming the account back.
I don't have a spare number to test, but I'm pretty sure entering a phone number in the web sends a SMS code. Do you have concrete evidence that it really doesn't work?
Unfortunetly not, I must test it also.