We shouldn't mark Amazon iframes as unsupported because they are not used as ads on this site, but as items in some shopping related articles. When we present pages/IVs without those Amazon widgets, the reader doesn't understand what the article is talking about and where can he/she buy the item the paragraph is describing (look at the battery example from this article).

Google Translate:
"Recently, we have seen the expansion of external batteries, which also offer wireless charging of devices (according to the Qi standard, supported by all phones). Some, like this, can even be recharged wirelessly, although this is a bit of no use because it's slow. Concrete battery has a capacity of 10,000 mAh and costs 30 euros."

This makes no sense without the Amazon widget. It's not a good idea to replace the widget with a regular link, as we can't parse the item image, title, and price.