Because that version is an older, lower-quality theater rip (HDTS), most modern subtitle sites have replaced those files with subtitles for higher-quality Blu-ray or Digital releases. However, you can generally find what you need by visiting these major subtitle repositories and searching for "Venom 2018":
: Usually hosts subs for high-quality rips, but may have legacy files. Quick Tips for a Better Match subtitle Venom.2018.V3.New.Src.HDTS.x264.AC3-iM...
: A massive database; look for the "HDTS" or "V3" tags in the file names. Because that version is an older, lower-quality theater
: Often has the largest collection of user-uploaded subtitles for specific scene releases. Because that version is an older