If this is something their users actually wanted, they'd be paying xAI, not the other way around.
That's just not true. If Telegram wanted it a small amount, and xAI wanted it a large amount, it would be normal for Telegram to negotiate to get paid for doing it.
There's no reason for Grok to pay this much for the deal unless either Telegram sees it as a net negative that needs reimbursement or they're competing with other bids.