Lots of other launchpads enable contribution via BUSD, instead of BNB, ETH, or MATIC. i strongly suggest polkastarter to do the same, as this will eliminate price uncertainties prior to the IDO. As i mentioned in point 2, please do away from erc20 IDO due to the crazy gas fee. If you are doing on bsc, then BUSD is great. On polygon, usdt/usdc is good enough.