Today, I'm at the coworking office.
They made changes on the internet connection, and the company that manages the wifi, router, network configs, etc., changed the hardware (especially the router itself).
I tried to setup OpenDNS's custom DNS setup on my network.
And apparently, the IP address from OpenDNS is the one that the new router uses to redirect to its maintenance portal.
They told me "We've always done that without issues"
Well, it's been 8 years, lucky they didn't have issues.