Yeah, they were selling something about that size to keep bettas in at the LFS I usually go to - I was looking at them and thinking I needed something to put a snail in for a bit while I'm redoing a tank I plan to get to pretty soon, although that was obviously grossly waaaaay too small for a snail.
I wanted to discuss the subject (in a polite and reasonable fashion) with one of the owners, who was actually in and not over-busy, but I've already embarrassed my father, who was with me, at another place where we go for pet food, by pointing out that the bettas needed a water change, politely offering to do it myself when told only one person was allowed to do that and who would be in the next day, and then not going anywhere until somebody did change it.
I don't think they like me there anymore, since it's not the first time I've done something like that...
On the other hand, their fish care has improved considerably, so I doubt I'm the only one.
So I still haven't even registered a polite protest with the owners about those things, which I term 'picture frames', although I've mentioned them to various staff on more than one occasion.
Kind of make one think of the Iron Maiden devices people were locked into as a torture, doesn't it - before civilized protections were emplaced?
(Edit - still haven't found the bib Netty said she posted for me, to prevent the drooling I do over bettas from affecting my keyboard, so I'm still using that as an excuse for my typos...)