I'm a bit skeptical about Atalanta's chances, but I love their underdog spirit! They've been playing some great football and their home ground is always a tough place for opponents to visit. If they can keep up their attacking momentum and catch Inter off guard, it could be a fascinating match. That being said, I think Inter's experience and depth in their squad will ultimately give them the edge, but it's going to be a closely contested game nonetheless.
When you say that just because Atalanta are playing Inter in Serie A then your objectivity if you want to take a gamble seems to be lost and that would be very dangerous I think.
Atalanta are indeed in terms of popularity still below Inter but when talking about performance I think they are not much different from Inter and the evidence that Atalanta are currently only 2 points behind Inter in the standings is proof that for now they cannot be underestimated.
Last week they destroyed Juventus with 4 goals without reply and it could be that when Inter think this is an easy match then it could be that conditions like this can happen in this match especially when they will play home this week which makes them clearly benefit from supporters who can be more encouraging for them.