Just a point here, you're talking about MTG Arena, which is the new online game. There's a much older game still called MTG Online which preserves the gambling aspect, where you buy packs and event entries for real money as well as trade cards with other users (and through a number of legitimate third parties, even buy and sell singles for real money). They even go one step further: if you can collect all the digital cards of a set while they have physical product available, you can exchange the digital set for a factory-sealed physical print run of the set (https://www.mtgo.com/en/mtgo/redemption).

I kinda waffle between the two. Arena's my first love for the reasons you mention, but sometimes it's nice to simply buy some singles and throw together a (Pauper) deck for some fun on MTGO Online (especially since their set selection goes much farther back). I never play that one competitively, though. Feels like playing online poker against a community that's been refined down to 100% professional grinders or wannabes.