I currently use Wahoo Fitness on my Android phone, the power data between that and what Strava displays after I upload are minimal, maybe 2-3W. I think that is acceptable. 40W sounds like a lot, though.
On the thread, if you think 6/month is too much, great, but stop whining like a little *****. Also, makes you (general you) sound hypocritical, if you really don't care for the product, why so upset?