That's just advertising. They will accept sponsorship from many many companies.
Marco Arment is not exactly a starving indie developer and podcaster between the equity he had in Tumblr. Whatever he got from selling Instapaper, running his own successful ad network for Overcast.
On top of that, he was an early investor in Gimlet Media that just got acquired.
In what way does that matter? Can you vlan them directly on the wireless router that way? Or are these devices 'all in one' routers (i.e. both wireless and wired)?
But will they stop accepting eero as a sponsor? I could easily see that happening.