My knowledge about blockchains

I know so little about blockchains especially ethereum

Some say ethereum is fully decentralized

And EVM compatible blockchains like Binance Smart Chain

Polygon, Avalanche and Heco are not as decentralized as ethereum

But their gas fees are cheaper but

I do not know the differences between these networks

But they are derived from ethereum I think

I do not know whether they are modified version of ethereum or not

I think someday they may fade away and disappear

My assumption may be wrong as I have little knowledge about them

But I cannot use ethereum blockchain as the gas fees are too high

No matter they are decentralized or not

I mostly use BSC chain now as it is cheaper and

There are many dapps on BSC chain