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They'd probably get all of their Twitter API key's revoked for "Duplicate Functionality." The 1.1 Developer Rules of the road are pretty harsh if you're syndicating tweets.

Theoretically nothing, but who wants to break up their product like that? The number of different versions would scare away users and they probably wouldn't reach 100k in the first place. How would they identify versions that have reached a token limit?

Actually theoretically Twitter will probably revoke all their tokens and their API key for trying to run around their rules.

What prevents it is the non-existence of a contract. Twitter devs live at the mercy of Twitter Inc, which can and will alter the rules as it benefits them. You're not going to skirt the rules with a technicality.