This is literally how their search API works. Except the limit is more like 25 queries a day and the price would be closer to $40/mo for average user's usage.
Just to clarify. The API pricing is 100 requests per day for free and $5 for every 1000 requests over that. But, the API is limited to 10 items per request. Their own UI provides up to 100 results per page (the setting seems to be hidden now, but is still active for users who set it before), which would require multiple requests to match, plus an image and/or video carousels each of which require an additional query, opening images tab preloads 50 images just to fill the screen, which is 4 more requests minimum for any image search, and, given how clicking each image also loads a bunch of related images, the estimate of 4 requests per search is very conservative. I use search on average about 80 times a day, and, doing the math, it would cost me on average $33.48 per month to do my searches using their API instead of using the free and unlimited official UI. This is ridiculous. And then twitter and reddit did exactly the same thing, too.