There could be a series of github projects that generate bad random datastreams using those old, deprecated generators and "typical" starting seeds (e.g. 0, current Unix time, small integers that might be process ids) and feeds the results in to the rest.randomsanity.org database.
The only exception I can think of is if their code has a development mode that uses a fixed seed for an otherwise good PRNG, and they forget to flip the switch to use a good seed before deploying to production.
In any case, it won't hurt to seed the database with bad randomness. Just don't go crazy, you'll get rate-limited if you make too many requests.