Right, but doesn't what you just described kill the joy of the hobby from day one?
If something is worth millions on day one just for the sheer fact that there is a 1 in 1,000,000 chance of pulling it, what is stopping a billionaire with nothing better to do from just buying up all the packs and hoarding all the ultra-rare cards? The chance of a regular collector pulling that Shohei Ohtani card will be virtually zero, as they will pushed out from competition entirely by those who can simply buy more packs. The fact that these are digital packs even takes out the physical challenge of acquiring cards that normally took place. Before, you'd need to at least put in some effort to physically obtain cards - even if you had money to burn, you'd have to physically drive around to different retailers to buy up stock, or establish connections that could get you boxes of sealed product. Now, is there anything in place that prevents a billionaire from pressing one button and buying up 90% of the released digital packs?
The "magic" of physical card collecting comes from the fact that anyone can pull any ultra-rare card and do as they wish with it. They can experience joy in holding it from day one (as its rarity will still be known from day one), they can play the card if it's a playable trading card game and get joy out of it that way, or if they are ultra-enthusiasts they can hold onto their collected cards for 10, 20, 30 years at which point some of those cards may become pieces of collectible history, in which case that person's passion or determination is rewarded through the means of those cards potentially being worth a lot of money. The fact that it potentially takes ~20+ years of holding something that might one day be worth something makes these physical cards a market that ANYONE can enter and invest in; on the other hand if you just impose scarcity from day one and create an environment wherein a card is potentially worth a million dollars right away just for the sheer fact that it's pull-rate is astronomically low, then you just enable a money-laundering avenue for millionaires and billionaires who can box out the regular consumer from competing for that card entirely.