Earlier quoted context omitted.
Pavel clearly has a social agenda behind Telegram. He wants to provide access to independent uncensored communication platform to everyone for free. So looks like ads is the only other option left for now.
Today ads never come without tracking. This is the problem. And even without tracking ads are a kind of garbage I don't want anyway. So, the day I get ads in Telegram I'm leaving. At the same time I wouldn't mind a reasonable (~1$/month, I don't do anything heavy, text messaging only) subscription.
Won't work. The vast majority people don't pay for messaging service, and without people, there's no messaging app. Ads are the only way forward.
Will they offer an optional ad-free subscription? Maybe, but I wouldn't count on that, and it's likely to be higher than $1/month.
> So, the day I get ads in Telegram I'm leaving
Nobody cares.