DDG has been around for a long-long time, and when it started Perl was an old fashioned choice but still very reasonable. Even if they moved to other languages

DDG has been around for a long-long time, and when it started Perl was an old fashioned choice but still very reasonable. Even if they moved to other languages they probably still have old bits of Perl code running somewhere. For about first 5-10 years of its existence DuckDuckGo also promoted their use of Perl, and afaik they contributed to Perl development.