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Private premium channel shill, I thought why not give it a try. So we click and next moment I'm greeted with this personal message, shilling 1xbet which is notorious for being scammer here, and I was joined in" premium" channel where there were already 76k members, lol.
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The owner of that bot/channel could be just a user of 1xbet trying to get referrals using his code/link, or it's probably a bought/rented channel to help shill the site.
This is pretty normal in Telegram, you can even subscribe on other's bot and advertise anything you want.
... I never thought that Telegram can be used for downloading music. lol.