I agree, these guys on Fiverr are selling the same links / redirects to everyone and anyone so logic would say they're spam. I sent a my website info to one of them about 6 months ago and he said he can improve the metrics. I never went with him but when I checked fiverr again today, he's nowhere to be seen. What's more, the new sellers all have few reviews. I'm sure it's the same people creating new profiles over and over until they get caught out. Fiverr seem to support this.