I've personally used services like this one and others just to test the efficiency of it vs natural link building techniques and the conclusion I came to is that even if it was legal, it would still be a waste of time. These types of bought links fall away eventually as they make space for the next person wanting to buy it and I think that a certain aspect of those sites are focused on automated / generated content which will get flagged later on turning those high DA links into spammy links that bring over penalties and spam score anyways. The links you can buy that are "safe" would be costing you around $400 per link so unless if you have a huge piggy bank ~ that's not an option either. Advice would be to forget about paid links completely and focus on the guidlines the search engines give you and just go the natural route.
Best posts made by Isildur
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RE: Is there such a thing as buying white hat backlinks? (example)
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RE: Beware of Fishy 4-Star Reviews
I've seen this happen on other platforms like Facebook a long time ago as well. I enabled reviews for a client and saw around 80 - 100 reviews and all of them were a 4-star rating. At the time I knew it was fishy. I reached out to all the people leaving the reviews but most of the profiles were new and empty and never responded. I didn't think too much of it because in essence having a score between 4 - 5 is still good. I also thought that when the 1-star review come as they always do, that the higher score with a lot of weight would keep the actual score high for a longer period of time before dipping below 4.
Long story short, the (fake) reviews went from 4 down to 3 and after an extended period of time, it went from 3 - 2 etc. We had to eventually disable reviews but I've seen that strategy apply to other sites as well. Trustpilot, WOT and even on review sites.