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I guess it actually makes a lot of sense, this is because sending SMS costs money, sometimes quite a lot when you are doing it at scale, if the user is paying you at least recoup those expenses.

Does this mean twitter no longer immediately disables new accounts when they fail to add a phone number for receiving 2FA?

Probably. I don't have 2fa enabled right now. Although I will probably switch to google auth very soon.

The rationale is that 2FA was being abused by some telcos with sockpuppets at a net cost of (ostensibly) some 50+Million a year for twitter.

If that's true, and because it's the least secure MFA option, I don't see it being that difficult or controversial of a decision.

I also do enjoy that this is listed as an 800% increase, not really how 0->$8 works.