perfect for my skyblock server gg :O .

As of version 1.0:
After testing and comparing this copy of my own plugin (made with obvious intent to impersonate) here is what I found.
First, the filtered hoppers can only be obtained through a command, which doesn't really make sense since if a filter is empty it'll act like a normal hopper anyways.
Then, since the filter is accessed by right-clicking on the hopper, the hopper's inventory is inaccessible. This is bad for a NUMBER of reasons but here's just one: if an item gets stuck that you need to retrieve, you have to either empty out the chest below or break the hopper. Very annoying.
More importantly, the filters don't even work. I've tried with a lot of different items but each time, whether the item is in the filter or not, it goes through no matter what.
Finally, even though this plugin doesn't work in the slightest, after reviewing Spark profilers and heapdumps, I've seen that it somehow uses more memory and processing power than an actually working plugin (like mine)
There it is, your review which, this time, has many explained problems and isn't "undeserved"
Next time, please be more mature when answering private conversations instead of dropping "skill issue" multiple times.
Thank you.