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Yes, PiHole is the most common, but malware can easily bypass that using shared domains, P2P or IP addresses directly.

Use a filtering proxy instead and no gateway / route to the internet.

1) Dnsmasq, you don't need the whole PiHole for that.

2) You're advising security through obscurity instead of a network namespace + firewall.

Please explain #2. How is a filtering proxy security through obscurity?

You mean like PiHole or AdGuard?

OpenSnitch (+ block lists) ;)

or DNS stubs with filtering capabilities.