Doesn't the very act of installing something on your devices increase their technical ability to collect information about you and your devices? That doesn't sound very privacy-oriented.
Apple is a regular company and gets points for adding privacy features. DDG? “Nah, F that, they suggested I run code on my device for a brand-new unrelated service. Reprehensible.”
Most privacy oriented companies don't care about your data, but they need to be able to see diagnostic information about your session for when things don't work. Oh and guess what? Things don't work for many users due to all kinds of crazy stuff, with viruses, proxies, crap internet, crap browsers, crappier browser extensions, or just plain user stupidity causing 99% of it.
Diagnostic data and basic telemetry allows software engineers to find the root cause.