I'm a moderator on another forum, and we've never encountered more than a few spam posts at a time, usually only a simple one or two. And we'll go days or even weeks without a single spam post. I don't know if it's the popularity of Roku that makes it a magnet, or if it's the forum software they use. I've volunteered to be a mod here, but never received a response.
Nvidia Shield, Roku Stick (3600), Ultra (4640), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.