I agree, keeping a betta in a vase is already not going to let the fish live a very happy life but saying they eat plant roots? That's just ridiculous. Sometimes I wish my bettas would eat some more plant matter like my other fish do, tried with veggie flakes and got the evil stare lol.
wow. This 'new idea' cycled back around. THAT is the sad part. I confess to having one of these in the 90s but even as a newbie I knew bettas wouldn't eat the plant; I put a straw through the root ball and dropped pellets in. Fortunately the plant wilted so badly that I disassembled it.