Thanks for the answer. This is a useful option, the DDG already has over 13,000 bangs, you can submit yours (but that’s by the way). The most important thing is that you can submit your query to another search engine. This is useful because the DDG also do not always know everything. Good to have more options.
Unfortunately, yesterday I read that BSB limits the number of results to twenty, and for me this is too little. I’m used to freely search the Internet, without limit. It would be very inconvenient.
I will become interested in this search engine again when the restriction disappears. For now, I give up use.