[dannyw]

How do I block this on Android?

[StavrosK]

You can do things that range from cutting off data access to the app to installing Blokada and cutting off access via DNS.

[kawera]

NetGuard is another option for DNS filtering.

[mcraiha]

AFAIK in vanilla Android you have to use VPN if you want to block access to certain domain for all the apps.

[kevin_thibedeau]

NoRoot Firewall