To block adds in android apps, there is DNS66 available on f-droid. https://f-droid.org/packages/org.jak_linux.dns66/

Thanks. From that page -

> NOTE: Dvelopment has stopped. The newer dev.clombardo.dnsnet continues development.

DNSNet

	▲	jenadine 3 days ago \| parent [-]
		Looks like I've been using an outdated version for a few years. Thanks for the notification.