The worst how-to guide when one step is 'click on buy'. Like others said, there are HEIC codecs like CopyTrans that are free for personal use. Windows explorer thumbnails and even Irfanview is able to view them after installing CopyTrans' codec.
This one's really crap compred to the TP-Link when you look at the graphs and the price, but it's never mentioned anywhere in the article that it's crap.
There aren't any big publishers in the VR "tank" yet because the Rift is PC only, and most companies have shifted to consoles first and PC last approach.
There's extensive statistics of clicks vs views, dropping prices of ads, etc. The most important stat (from the heading) IMHO, the percentage of users using adblocker is conveniently ignored. This article is a scare tactic.
Disk defragmentation is to avoid the mechanical head from moving back & forth too much, hence prolonging it's life. SSDs have no moving head or parts. So the short answer is no.