hey @Supreme
I think there are two questions at issue here. One is voting on snapshot / tally on Gitcoin Governance proposals, the other is making donations/contributing/voting via the Gitcoin Grants rounds.
For stewards voting on Gitcoin proposals with a COI, Gitcoin does have a policy prohibiting this activity and you can find it here Gitcoin DAO Governance Process v3). I think our stewards and contributors do an admirable job sticking with this policy and we do have robust conversations on the forum (see `here debating this. If we missed the mark at some point, please pass over any examples and we will for sure look into it.
Regarding stewards on contributors making donations to grants rounds, based on my reading of the Gitcoin Beta round eligibility document, it looks like there is no prohibition for grantees donating to their own cause, or causes they may be involved with.
I could be wrong on this last interpretation so I welcome input from the PGF team - they for sure will know more than I about this case.