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It's dilute the reward pool and create a system where only those who can afford to pay for a bot earn reward. They vote on anything even if it's a piece of trash. And lastly they swallow too much. Will collect the Monday paid them and still take the curator's reward.

That is just it. You are correct. I wonder why it is like that

It's because of greed and a thirst for power coupled with short sighted ignorance of long term effect or apathy.