Affiliates were among the earliest adopters of pay per click advertising when the first pay-per-click search engines emerged during the end of the 1990s. Later in 2000 Google launched its pay per click service, Google AdWords, which is responsible for the widespread use and acceptance of pay per click as an advertising channel. An increasing number of merchants engaged in pay per click advertising, either directly or via a search marketing agency, and realized that this space was already occupied by their affiliates. Although this situation alone created advertising channel conflicts and debates between advertisers and affiliates, the largest issue concerned affiliates bidding on advertisers names, brands, and trademarks. Several advertisers began to adjust their affiliate program terms to prohibit their affiliates from bidding on those type of keywords. Some advertisers, however, did and still do embrace this behavior, going so far as to allow, or even encourage, affiliates to bid on any term, including the advertiser's trademarks.
I guess the only thing I’d say about this is if you are blogging in a competitive niche and working in what I’d call the “gray area” of link masking and not using “nofollow” as described here by google (https://support.google.com/webmasters/answer/96569?hl=en) expect that competitors that are writing real reviews with real photos (not stuff grabbed from a manufacturers website) are going to report you to google as webspam. The thing I hate most is affiliate sites that have never held a product in their hand and then try to pass off something as a first person review for the sole sake of pushing you to Amazon.com.
If you are writing online your posts should be brief, clear, checked for spelling and grammar and consistent. Your blog may not have broad appeal if it has limitations in these, so your EBooks and public posts can benefit from a professional proof-reader, or extra classes in English, whether it is your first language or not. Whether you write a blog, a book or anything else, your only tool to deliver your message is language, and you should gain all the skills you can with it. If you don’t have time for this, use the services of someone with the best language skills you can find.
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In February 2000, Amazon announced that it had been granted a patent on components of an affiliate program. The patent application was submitted in June 1997, which predates most affiliate programs, but not PC Flowers & Gifts.com (October 1994), AutoWeb.com (October 1995), Kbkids.com/BrainPlay.com (January 1996), EPage (April 1996), and several others.