It is possible that several of the spamming accounts are operated by the Stake campaign manager. As many of us would never associated with the low quality spamming accounts yet Stake opted do it, the possibility remains the campaign manager might have enrolled accounts they are controlling.

Such is the sub-standard  level of posting there that who from Stake would notice whether their campaign manager was doing a good job or not (or accepting some of their own accounts in the campaign).

Of course, some accounts are posting in a constructive manner but many are just posting nonsense to meet their campaign quota and in effect getting paid for it.