Yes, the significant increase in Bitcoin on-chain transaction fees is likely due to network congestion. When transaction volume exceeds the network's capacity—limited by its 1MB block size and 10-minute block intervals—a backlog forms in the mempool. Miners prioritize transactions with higher fees, driving costs up during peak demand. Recent trends, like increased activity from Ordinals or token protocols, have historically amplified congestion, pushing fees higher. For instance, past spikes have seen fees exceed $30. Solutions like the Lightning Network aim to ease this pressure, but on-chain fees remain sensitive to network load.