Because you can inject your ad network (https://myoffrz.com/en/fuer-nutzer/) more easily if you have your own search engine, people like Google don't let you use your own ads on their results generally.
I don't disagree with the premise, after all I was part of a team that tried to do the same thing (well, without the ad network) and discovered that the adtech business has become so corrupt (not that it is all corrupt just that enough of it is) that the only way to cover the costs of running the thousand or so machines you need to hold a decent index and cache is hard to achieve.
Curious what you mean by "corrupt" here. I'm genuinely curious as I've never worked at a company in ad-tech before, so it's always fascinating got me to hear from insiders.
Ad networks that push adware or malware that facilitate click fraud. I would guess that anywhere from 2 to 3 billion dollars spent on Internet advertising each year is ending up in the hands of corrupt ad tech vendors.
I don't disagree with the premise, after all I was part of a team that tried to do the same thing (well, without the ad network) and discovered that the adtech business has become so corrupt (not that it is all corrupt just that enough of it is) that the only way to cover the costs of running the thousand or so machines you need to hold a decent index and cache is hard to achieve.