<p><img src="https://images.cointelegraph.com/images/840_aHR0cHM6Ly9zMy5jb2ludGVsZWdyYXBoLmNvbS91cGxvYWRzLzIwMjQtMDgvMDE5MWEzN2ItZDE4MS03NGY1LTlmMmQtODRmMTI4YTcwYmE0.jpg"></p><p> Layer 2s are a short-term success story, but the long-term picture appears less rosy.</p>