Particularly because the major players other than LinkedIn basically rely entirely on Google. All Indeed, Monster, CareerBuilder do is buy Google Ads and then essentially resells the marketing. This is similar to the situation TripAdvisor is in but generally worse.
The current job boards / job aggregators (the companies above) are terribly unimaginative, generally not helpful and often price gouge companies (if you wondering the what the difference is between aggregator and job board... there really isn't much but one pulls the jobs aka crawls the web for them).
Now the boards/aggregators are trying to become more service based and offer higher value offerings for long term strategic reasons. Indeed is rolling out "Indeed Prime" and I believe Career Builder is offering something similar as well.
So as creepy as it is that Google is in the recruiting space I am optimistic that will finally provide some spark of innovation that is much needed in a very high touch industry devoid of it.