"Netflix does contribute financially to the FreeBSD Foundation and has done so since 2012. Last year they engaged at the "platinum" level with contributing more than $50,000+ USD to the foundation." (2019)

Took about five seconds to Google, it's the first result for "netflix donations to freebsd".

NFLX Q3 2019 earnings were about $5.2B.

So about 0.001%, I guess.