Jameson Lopp, co-founder of Bitcoin hosting company Casa, said that due to factors such as "block storms" and subject to "slightly different consensus rules from the main network", the Bitcoin test network occasionally generates more than 10,000 blocks in a day, while the Bitcoin main network generates an average of 144 blocks per day. This has resulted in the current block height of the test network being 2,811,000, which is equivalent to the height of the Bitcoin main network in 2061. As a result, the rewards for miners on the test network have been reduced to near zero, making the network almost unusable for developers.
Jameson Lopp recommends that Bitcoin developers and users migrate their infrastructure to testnet4 in the coming months. (Cointelegraph)