It's all about engagement. Adding fake likes could give "genuine" people the feeling your ad is trustworthy. This will result in more/cheaper likes, comments, shares and conversions eventually. So yes, it could have a positive effect on the algo.
But, when your accounts/ads/pages are /flagged/linked/drenched with fake accounts and fake engagement you will get punished with bad traffic and high costs. If you really make it bad they will ban you eventually ofcourse.
We often see the first 1-5 comments set a trend for the rest of the comments. For example if I comment on one of my ads with one of my pages something like "liked and shared". You see the masses often follow and a snowball effect appears. This could also be the case with a negative comment ofcourse.