I am an ingrained worrier about all things techie so I do have an anti virus app on my android phone, along side the same virus app on my computer, my laptop and chromebook.
I would rather have that little bit of a security blanket in case all my vigilance in keeping myself safe on line fails. Happily my Bitdefender passed the test with a 100% success rate and I have more than enough free resources on my phone to not notice it.
Having read the report I was more interested in the fact that so many of those tested failed and that so many of them were total cons.