If you can configure the DNS servers directly or via DHCP in the network settings of the device, then you can take control of how domains get resolved at that level.

In fact I've (unintentionally) bypassed site-blocking on some public networks, just because I configure my devices to use public DNS servers instead of whatever the DHCP provides.

Rooted Android works. You can swap the /etc/hosts file.

Plugins such as uBlock Origin should allow for adding hosts to blocklists.

Not an option for 99% of the users.

"Root your phone to install an adblocker" isn't exactly uncommon knowledge to non-technical users.

Most people don't want to root their phones.