Non tracking ads bring very little revenue as ads all about effectiveness. After initial experiments and cool off period you’ll either see more ads, tracking or scaling down of operations due to limited revenue.
I assume you do understand that you seeing ads for outdoor headlamp you've ordered weeks ago is a proof that you actually have some privacy? Conversion signal (as in - you've purchased the product) didn't reach the ad network, for whatever reason.
Also - what do you think brings more money for the publisher - ad for outdoor headlamp (that you already bought, but still, you're potentially "lucrative" customer, as you are interested in this product) or a same ad for Windows 10 for 3 years, while you run everything on Linux and never touched Windows in your whole life?
"Tech" is a very very broad category. There's a reason why tech sites serve non-tech ads and personalized ads took over internet.