Once upon a time, there was a cute little idea of paying a tiny amount of money and getting a surprise. What you got didn't matter because everything was good. You could even trade the items to get something you wanted more or chase "the rare" which you had a fair chance of getting ahold of. The people loved it and felt like they won every time, just a tiny bit of money and they had something they liked or could trade away. The creators could make small novelties for people to collect and hunt and the income was sustainable. All was good and the wise old Linden let it be.
Then one day someone said "Why don't we create a special experience for getting the rare item? No one can have this experience unless they pull the rare". There were some hrms and hums of disapproval but they did it anyhow. Now the rare was special and everyone wanted it but everything else was still good, just not as good as it was before.
Then one day someone said "Why don't we make it even harder to pull the rare and make all the commons very plain or less desirable colors? Then they'll play the machine more and more". There were loud hrms and hums of disapproval but they did it anyhow. Now the commons were near worthless and next to no one wanted them because that's all anyone got.
Then one day someone said "Why don't we base the entire gacha around the rare? Why don't we make the rare first and make all the common items go with it? Then they'll keep playing until they get the rare". There were very loud hrms and hums of disapproval but they did it anyhow. Now the rare was needed to fully enjoy the other items and everyone had to have it. The other items were disappointing and in some cases, useless without the rare.
Then one day someone said "Why don't we make it near impossible to get anything but commons so that only rares and uncommons are truly valuable? Instead of fun, let's make this about rarity value". There were angry hrms and hums of disapproval but they did it anyhow. Now next to no one got what they wanted unless they were fortunate and dumped a fortune into the machine. No one was happy but the creators making the money and of course the resellers who got those rares and changed serious bank for them.
Then one day the law said "Hey, that's taking advantage of people and that's not cool. You can't do that. Those are all banned now." and the creators cried "What? But how will we make money now! What about the economy?" and then the wise old Linden swept down and told them "If you hadn't made you machines more and more of a money sink and used people unfairly, the law wouldn't exist. You took advantage of people and now, you ruined it for everyone. Now we have to take it away because you turned something that was fun into exploitation."
And the lesson is...
People will always find a way to ruin something for their own gain. This is why we can't have nice things.