These are individual "users" not necessarily equating to individual "people"... The other more plausible and sinister explanation is that they are simply front

These are individual "users" not necessarily equating to individual "people"... The other more plausible and sinister explanation is that they are simply front's for organisations through which many people contribute to carefully manipulate online perception through legitimate looking user accounts. This would explain the high volume and yet high quality - compared to spam bot reviews which are low effort reposts or simple automatic rephrasing of a pool of content. Instead it would be manually crafted output, by many individuals, spinning a consistent and genuine sounding individual "character".