What's the catch with the SB search engine?

So, SwagBucks promises free SB, as long as you search with their search engine (reskinned Yahoo) and do captchas when it decides to give you a prize.

But, what's the catch? Is there a daily limit? Is the chance for a reward minimal?

submitted by /u/Ondrashek06
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source https://www.reddit.com/r/beermoney/comments/lp57ag/whats_the_catch_with_the_sb_search_engine/