Cryptocurrency industry is actively developing and a lot of blockchains appear which are faster and has lower commissions that Ethereum blockchain.
Such blockchians offer developers more opportunities that is why they are used more often and becomes more popular.
It is hard to say what blockchains is better Ethereum or other blockchain.
Ethereum blockchain is the most popular one but it has the highest commissions which make the use of blockchain unprofitable.
Because of big commissions in Ethereum blockchain more and more developers now are looking for the opportunites of othere blockchains that are faster, cheaper and allow to make cross-chain transactions.