Can I add 3 more characteristics?
a) All the tipsters' records are too good to be believed with large double digit (or bigger) yields.
b) Tipster domains will often be hosted on the same IP/ASN as the monitoring site.
c) If Google Analytics is used to monitor traffic you may find the same user ID on the tipster site as the monitor.
As with a tipster, you always need to check out the monitor too. If they are using the word "independent" you need to make sure that is true by applying all these tests. If you don't do the due diligence you only have yourself to blame if you get badly ripped off.