No offence to your post, and yes peanut lab surveys are a fine way to earn free credits.
If you live in the right state, have the right zip code, work part time, shave left handed, eat at a fast food restaurant every other day, have a pet monkey, attended a yodeling competition, married two people, and still you might not meet the criteria, because of race and gender?
but an hour of work in a survey can result in $1.26 worth of credits. if time allows.
Just saying they make it as difficult as possible to complete these surveys.