Who told you that other applications aren't been created on other blockchain? Are you sure you doing enough research because it's clear that Luna, matic, BSC, solana, polkadot and avalanche are developers favourite right now, only very few still stick with ETH, do your own research
What made you say that it's developers favorite? They may have their own personal preference but I don't think these devs really favor one blockchain over the other base on that. They are probably more focused on the number of users and the money that flows into them. There's a reason why liquidity on Ethereum remains the highest like this guy said,
in ethereum concetrate big money