Hate to say it, but that didn't really make me feel bad about bettas in small bowls. If that was its intended effect. They fish didn't look sick at all, the water wasn't nasty, and only one looked like it might be recovering from fin rot. If anything, they looked a little crammed. I understand those rows of jars were typically the housing for male bettas that breeders use until their fish get sold. Now, a critique isn't complete without a little "how to make this more effective" tip. If they were going to make people aware of the horrors of small bowls, then they should have chosen to show images of fish in terrible conditions. Fish that look sick, fish that live in nasty water...etc. Otherwise, no one's gonna get an emotional response. However, if it just so happens that the only images this person can find are of bettas that look healthy and are in clean environments, then his/her argument is kaput. If people SEE healthy looking bettas, then they're only going to think "Man this person is making a big deal out of nothing."
Another example: There's a video of a puppy mill. The text in the video tells you how BAD puppy mills are, but the video shows happy puppies frolicing around in "OK" conditions. Not good, but not bad either. This video will not get much of an emotional response because the puppies look mostly healthy.
EDIT: Actually let me post that under the video as some constructive criticism.