Paid search engine makes sense to me but paid browser does not. The browser's target audience will have a better experience using a free of charge and Open Source browser than a paid one because the paid browser won't integrate very well with package managers.
This is off topic but their search engine pricing is quite scummy. Either you pay $5 for 300 searches per month, which is too little, or you pay $10 for unlimited searches, which is too many for a mere mortal. They are trying to up-sell the $10 subscription.