I guess it's up to us betta/fish lovers to educate... yes, a betta can "survive" in a tiny container of let's say a quart (or less) of water... but it will "thrive" in much larger containers. I've always been told by many fish keepers that a rule of thumb to go by is you should have 1 gallon for every inch of fish you have. Therefore... a betta (including finnage) could be 2-3 inches long... that means at least a 2-3 gallon tank... just for them!
It's also been documented that bettas kept in small containers all their lives, live shorter lives (typically no more than 2-3 years)... and their autopsies have showed atrophied muscles and excess fatty deposits.... while bettas that have lived in larger containers lived much longer (up to 8 years!!)... and literally died of old-age - no muscular problems or fat issues. Obviously, they're happier in a larger tank where they can actually swim around and play.
Just like a dog or cat. Sure they can "survive" in a small cage... but would they be happy? Probably not.
Then today, I went to one LFS and saw the bettas stored in tiny, tiny cups - with barely enough water in them to cover their fins (and dirty to boot)... and under them were shelves filled with betta containers... much like one of the pictures you have there... it made me so sad... and angry.
Part of the charm of bettas to some people is that they're told they don't need much space... no small fish "needs" much space... but to live happily - they do!!! We're told... you can put them on your desk and it won't take up much room... you can put them on a small table... heck, you can hang a bowl on your wall (I've seen these on Ebay). It's very cruel in my opinion and should be outlawed. People have to have empathy for animals... fish or furry kinds... unfortunately, fish fall to the bottom of the scale...
I always get the argument... look where they come from... rice paddies and mud-holes in Thailand... Well... 1) The ones we buy are bred in captivity. 2) They do "swim/jump" from rice paddy to rice paddy (mud-hole to mud-hole) - they don't live in just ONE all their lives.
We really need to help educate. I've been talking with a salesperson at one of the aquarium stores I visit... I think I have him convinced now...
