justsomeguy33
Too much data to process than they are willing to put time in to
When handling with huge streams of data, like in for example a SOC it's the 'big' streams and patterns of data on which is zoomed in.
For this reason the system is made (and learns to) discriminate against payment methods that are known to be abused.
Is this bad? Well.. do you want these scam ads to be around to hurt for example, your grandma?
Perhaps it's a necessary evil to make it all work.
Yeah the automation is a big problem but this seems to be essential for their scalability to work and be able to provide us all with the services they offer.
Google does indeed discriminate on your payment method.
Most likely due to them having too much data to process they analyze the data from abusers and these kind of cards seem to stick out like a sore thumb.