In the last couple of months I have noticed an increasing trend of supplying me search results that are completely unrelated to the current query and tie back to my location or previous searches. I can say this with a high degree of certainty this is without a doubt beyond the 100th instance this has happened.
My browser is configured against tracking and fingerprinting (in fact all my devices are) which would make it fairly difficult to retain any data unless they are profiling me.
I have still the same good results in ddg, no matter what device or browser. I have noticed that they have some location bias when ddg (and any other search engine i have tried) has non good results globaly but good resulta locally.
Still better then anything i have tested. Just because there are minor anomalies i will stick with them.