What I can say on this is, one of the major reasons Ethereum gas fee increased was as a result of the huge number of projects on it, that is, all these projects contributed to the value ETH have today. Now having this at the back of our minds and drawing it to the Binance Smart Chain, it can be seen that the easy launching of projects lead to the increasing number of these projects on their network, and this is gradually leading to the increasing gas fee which is being seen now, most times it even gets congested.
That is to say as the Binance Smart Chain grows with more projects on it, the gas fee will be increasing. Another point is, these said gas fees depends on the price of BNB, that is, what the gas fee will be when BNB price is $300 is not what it will be when the price is $500 or $1000. It is happening to BSC now, and will also happen to others like Polygon, unless the blockchain is not growing.