There's a copycat effect at play too. Once something becomes well-known enough, it enters as an idea into more people's minds that it's a possible thing, and some will attempt it. Before it was smashing the stack, now it's supply chains etc. As for what you can do with an attack vector to motivate beyond a simple satisfaction in breaking something, an obvious popular choice now is ransomware. Ransomware attacks would still continue even if the world somehow got rid of cryptocurrencies, they would just use less convenient but more traditional forms of payment. Because ransomware became popular.