Juul sort of has to to survive though. Big tobacco wont tolerate an actual competitor.
But consider the counter case for a moment.
Altria didn't pay 13bn dollars, for just 35% of a company that is barely 5 years because they were confident did they? Hedging your bet is a sign of fear. And you generally still want the main bet to pay off. Altria would do better if Juul were banned, they'd lose 13bn but the rest of their portfolio would go up by considerably more than that.
It’s a way to get the kids hooked and make them life long customers.