assess whether CS is designed that way

It isn’t. There’s no grind to get better weapons so that you can remain competitive with other players and no paid lootboxes that give you an early advantage. You start out with the standard set of weapons just like any other player and that never changes. The only addicting thing about the boxes in CS2 is that they look cool but I’d say that that’s more on the player to decide whether they want it or not.

It’s like saying providing the ability to paint your car is an addicting business practice, which I don’t really buy. This is not the same as pay-to-win and the distinction should be made here.

That’s how it works on most games

Not really. A bunch of F2P games have lootboxes that give you a chance at better weapons / characters early on instead of going through a long grind. The set of CS weapons is the same and does not change.

The community gets upset when it becomes pay-to-win. I wouldn’t consider CS to be pay-to-win though so I find the casino comparison a bit inaccurate.