Hi,
Thanks for your interest! For the sake of complete openness and transparency with my customers I'll respond to you on here rather than via PM.
You won't own the parasites with this service, no. It's a similar setup to how a PBN service would operate, except it's niche/industry relevant web 2.0's that have relevant content posted to them (in the form of posts, with no backlinks pointing outwards) to ensure they appear natural and 'relevant' in Google's eyes. We then create pages (rather than posts) on these blogs for our customers. All blogs have 'about' and 'contact' pages and have been customised as much as possible, and will usually have other informational pages on there too (as well as the posts). I try and post several new posts to each blog every week.
The blog titles are largely very relevant, i.e. you'll never get a blog that's 'hgdhgdsh123.wordpress.com' for example. The videos, soundcloud track and images will be posted across several accounts (with the exception of Vimeo) and again these will have other content posted them to ensure they look real. The cumulative effect of the backlinks (from the optional backlink boost) will boost the blog as a whole and therefore all customers will benefit. I will also periodically send social signals to the blogs as well as I've found this a great way to keep the blog fresh in Google's eyes. I won't ever leave them to fade and rot - I want them to be as natural, relevant, active and longstanding as possible for the sake of my customers.
If any two customers were attempting to target exactly the same or very similar keywords then we'd put them on different blogs because we know that a lot of the time Google tends to only like ranking one page from a domain for a certain keyword/phrase.
I'm happy to provides samples if required.
I hope this helps!
Kasabian21.