Quite embarassed that it took me this long to notice this, maybe it is because I didn't visit shill subreddits often. Anyway, everytime you want to read about wether a product or service is of good quality or not you'll notice there's at least 5 alt accounts with no activity/post history and no karma shilling said product.
For example I've been looking for threads about an specific online bootcamp about programming. When I checked the comments it was full of alt accounts shilling that service. Checking every single profile of those posters I noticed they were accounts with no activity and low karma.
[–]Chipit 13 insightful - 2 fun13 insightful - 1 fun14 insightful - 1 fun14 insightful - 2 fun - (2 children)
[–]ClownWorld123[S] 6 insightful - 2 fun6 insightful - 1 fun7 insightful - 1 fun7 insightful - 2 fun - (1 child)
[–]slurper 3 insightful - 2 fun3 insightful - 1 fun4 insightful - 1 fun4 insightful - 2 fun - (0 children)
[–]iDontShift 11 insightful - 1 fun11 insightful - 0 fun12 insightful - 0 fun12 insightful - 1 fun - (0 children)
[–]SoCo 6 insightful - 1 fun6 insightful - 0 fun7 insightful - 0 fun7 insightful - 1 fun - (0 children)
[–]EternalSunset 4 insightful - 1 fun4 insightful - 0 fun5 insightful - 0 fun5 insightful - 1 fun - (0 children)