Alt accounts aren't as big a problem as many suspect. These are usually detected. They try to avoid detection by the use of VPNs, etc. but they inevitably screw up switching back and forth.
What concerns me the most are source customers who join MESO and post exclusively (or almost exclusively) in the source's thread. They regularly announce how great their experience with source. They camp out and bump the source thread discussing various topics that should be discussed in the relevant subforums dedicated to the topics of AAS, training, nutrition, bodybuilding, etc.
Most sources have these type of customers in their threads. They bury relevant info with fluff but mostly they are innocuous.
They become a concern when this "army" goes to bat for the source and attacks/dismisses/minimizes/refutes/etc other members who have a legitimate complaints or are dissatisfied or are warning members about potential harms, etc.
What motivates these type of members? How far would "satisfied" and "happy" customers naturally and organically go to defend their source?
I suspect they are incentivized in some manner. For example:
1) source simply asks satisfied customers to join and share their positive experiences;
2) source offers discounts or free products to reward customers who join and share positive experiences
If my experience moderating forums tells me anything, people will do a lot for free gear.
Sources could recruit reviewers for hire on Fiverr or Freelancer, etc. and pay them to join and pretend to be customers. I think this is less likely because there is no shortage of customers who will do it for free gear.
Having said all of that, I think members should be free to post positive reviews - it is actually encouraged. It just doesn't take more than a few posts to share these positive reviews. If someone is posting daily posts praising a source, with dozens or hundreds of posts in the source thread, then I would be suspicious.
I'm not saying every single one of them has been incentivized. There is a subset of customers who seem to thrive on having "personal" relationships with their drug dealers, who genuinely consider them friends. I can't understand this desire for such intimacy in a relationship that should just be transactional - but there is that.