DeFi lending platforms are popular because they are useful. The price of DeFi tokens grow because there is a big demand in them and many people use DeFi platforms for loans or to earn money on providing liquidity.
But over time it will become a very common thing among cryptocurrencies especially if there are a few shortcomings that will be found in DeFi, because every thing that has many advantages, of course there are one or two drawbacks in it.