Nope, not a bug ( Note 1 ).
This is how gacha games work. As Rook has said before, Legendary training is your best bet for 5* Heroes.
I budget $12 USD per month for 3 summons.
Event summons is the only way to get Event heroes like Guardian Jackal and Guardian Falcon.
Elemental summons is the fastest way to get a 4* of a specific color to fill a hole in your hero team.
150 gems for daily summons is a good way for Whales to level heroes.
Note 1)
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