For those looking to buy it off envato - that's the choice but if it was taken down for copyright then it's prob not wise to buy until that has been rectified.
If you buy it direct from the author then you have zero protection or access to updates etc. Unless the author chooses to privately support it.
As far as envato protecting buyers - the latest changes to offer 6 months support and lifetime updates for free was a big step in the right direction.
While I am 110% against people ripping others work, realistically there's only so much envato can do to double check in a marketplace with millions of files and tens if not hundreds of thousands of submissions every month.