Well this is new! I just had 2 surveys this morning that I went through completely, and at the end it said I didn't qualify and I only got the 0.25 credit. I emailed E-rewards and already got a response. Apparently I was flagged for "speeding" which means they think I didn't take the survey seriously. I did read every question, but many of these things are so repetitive, you can fly right through them. The response included these screenshots - kinda cool to see what metrics they are recording.
Guess next time I'll take a couple bathroom breaks in between questions to slow myself down