Blocking a domain blocks its subdomains too. Apps load from several domains, so the presets include the ones each app needs.
Setup
Slab checks these each time it opens.
Status
Options
Require tag to brick too
Off = you can also tap the slab in the app to start.
NextDNS
Good to know
Use Slab in Safari, not as a Home Screen app. iPhone keeps Home Screen web apps' data separate from Safari, and your NFC tag always opens Safari. Slab blocks at the network level: apps still open but their feeds won't load, so force-close them after bricking. You can always remove the profile in Settings. The point is the friction.
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Welcome to Slab
Setup takes about 5 minutes and only happens once. After that, Slab only asks again if something stops working.
You've opened Slab from the Home Screen. Open it in Safari instead, because your NFC tag always opens Safari and the two don't share data.
Install the profile
This sends your phone's DNS through your NextDNS blocklist.
Tap Allow when Safari asks.
Open Settings › Profile Downloaded › Install.
Settings › General › VPN & Device Management › DNS › choose Slab.