I think you missed the entire premise of Litebulb — they are avoiding Leetcode-style testing in favor of development tasks on the real business codebase, and quickly ramping up environments that are based on your business' proprietary dev stack.

Many software companies opt to avoid leetcode-like interviewing entirely. If leetcode and prepackaged, recycled, self-contained code tests are your workplace's primary process for hiring, then I don't think this service is for you at all.