Because you're farming rewards, and if you continue you will continue to earn nothing.

Hive isn't your personal bank and posting as often as you do makes it look like you're doing so simply for the rewards. You can continue of course, it is a free environment where you can act as you please...of course, that means that others also have the same rights.

The rewards people offer you are not yours until the expiration of the seven day period, until that time people people can add or subtract from them as they see fit, just like you can post as you see fit. I hope this is abundantly clear to you.

It is not an attack, merely people choosing to do as they please, as you have also done with your multiple (hourly) posts to gain rewards.