Ironically, Binance Smart Chain was part of what caused us to fail to launch my "end game solution" for that a while back and put me back into a design cycle (the exit for which or progress on I will not comment on here): we noticed their endpoints don't support eth_getLogs in a useful way.
(To be fair to them, neither does Polygon/Matic anymore, and there it was seemingly a more fundamental limitation... and, honestly, if it were only Binance Smart Chain that were limited, I would not have really cared as that chain is extremely centralized in a way I would find scary for our users.)
That seems to be an issue. However $60 fee still is insane and kills product. I have seen pankacakeswap defi used IPFS for decentralized voting. They use private wallet keys to sign vote and write it to IPFS. Maybe you could use IPFS as decentralized storage for that first block or other older blocks like a cache?
https://github.com/binance-chain/bsc/issues/113
(To be fair to them, neither does Polygon/Matic anymore, and there it was seemingly a more fundamental limitation... and, honestly, if it were only Binance Smart Chain that were limited, I would not have really cared as that chain is extremely centralized in a way I would find scary for our users.)
https://bitcoinist.com/get-educated-on-binance-smart-chain-d...