But for a small or medium flaw, you'd expect a bunch of people that complain but keep using it. Only a really big flaw would prevent users entirely and find no complaints among the people that keep using the product. I find it hard to believe it's that big of a flaw. It seems much more likely that the people that started off against the charging decided after trying it that they didn't care very much.
Maybe without this flaw they would use it.