As reference for others:
The issue is that SantaMonica, who runs the algaescrubbers.net site, has gone commercial.
He/she is now selling various new scrubbers, not just running a DIY scrubber community site.
So that site is now mixed.
Perhaps various posts could be considered viral marketing, trying to drive traffic to the site.
But a stretch, so I would not rush to get out the ban hammer just yet.