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If you are using Chrome, click the red hand button at the top right of the screen:
Then select: Don't run on pages on this site
If you do it correctly, the red hand will turn to green and you will no longer see this message.
This is an all or nothing penalty. If you have blocked more than 25 people you are given this penalty.
The reasoning behind this penalty is that if you are blocking more than 25 people, you're doing something vindictive, or, you're really to blame for something because you're giving a bunch of "block backs".
In either case, you can eliminate this penalty by keeping the number of members you block to 25 or less. If you block more, your status is penalized by 10%.