What you talk is “I pay for Legendary so I should get 4-5 star. But I don’t pay for daily draw so I don’t care for whatever.”
Completely for your narrow point of view but NOT for reason and logic.
In the US, wining a lowest Mega Million lottery is 1:37 (1: 6.6 billion for 1st prize winner) and scratch lottery is about 1:5.
What you insist is “Only 4 and 5 star heroes from Epic or Legendary draw”
That means “Lottery with everybody should win.” That’s completely non-sense and illogical.
Daily draw doesn’t cost any gems. However, it’s rare event and should be distinguished from routine acquisition.
I don’t know how often you get rare 3 star from farm but that’s for higher level gamer case and also occasional. One or two star are routine and get a lot from farm.
Drawing daily event doesn’t need gems but to draw you should visit once per 24 hours; OR when your level is up, you can get one.
Overall, only 1-3 daily gate can be opened. Worst scenario: 3 chances of daily draw give you only 3x one star garbage heroes.
That shouldn’t be happen.