Kagi. Search results are far better than DDG, and all the customizations they offer bump the quality higher than Google for me.
It allegedly costs them $1 for every 80 searches. On the 5 days of the week I do my day job I probably average 60-80 searches per day.
I think that clause is in their ToS to prevent actual misuse of the service, e.g. building a scraper. Saying that, I agree that it's a concerning provision.