I do not consider the current situation with expensive transactions on the bitcoin and ethereum networks as a sign of their failure. These were the first cryptocurrencies, and at first their throughput in terms of the number of transactions was not designed for such a high demand. The main thing is that each cryptocurrency is updated on time and eliminates deficiencies in accordance with the requirements of the time. The ethereum network, albeit with a delay, is now being radically updated and this problem is already being solved, and after August 4, after the London hard fork, it should go away completely. However, we see that in the bitcoin network as a whole, this problem has not yet been solved.