How to Block An Application from Accessing the Internet with Windows Firewall
Omnify Hotspot Premium - 3 Year en Steam
4 Ways to Disable Internet Access - wikiHow
How to block Steam from accessing the Internet | Radio Silence firewall
Omnify Hotspot - The Best Wi-Fi Hotspot & Repeater on Steam
Best VPNs for Steam (how to change region and unblock games)
Firewall blocking GOOGLE, STEAM, SPOTIFY - Windows 10 Forums
Update to this post, since a lot of amazing people offered solutions: Steam isn't blocked by the school wifi, it doesn't work on my phone's 4G either. I've allowed the ports Remote
Fix: Steam Won't Go Online
Using the 730 to block Valve/Steam - Check Point CheckMates
4 Ways to Disable Internet Access - wikiHow
How to block Steam from accessing the Internet | Radio Silence firewall