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WhatsApp sends out DNS probes to 8.8.8.8 unencrypted (TrackerControl does trap and proxy these). And spyware SDKs like InMobi and Gamooga do DNS over TCP which
by ignoramous 5y ago
WhatsApp sends out DNS probes to 8.8.8.8 unencrypted (TrackerControl does trap and proxy these).
And spyware SDKs like InMobi and Gamooga do DNS over TCP which almost all apps on Android leak (but TrackerControl does not).
Telegram does its own DoH (?). Instagram does hardcode some of its IPs, not all (TrackerControl has no mitigation for these).
Disclosure: I co-develop a similar app to TrackerControl