Depends on the overall stance on the governance program by the community (and the future of it). In my opinion self voting is a form of conflict of interest, therefore unethical. You basically put your own personal or financial interest above everything else. That’s not democratic and may be even harmful to the program or blockchain it’s future.
If it were to me, we’d have a code of conduct similar to Optimism (as an example). Where they have a passage that outlines rules against self-dealing in the Optimism community, including mandatory disclosure of conflicts of interest and prohibiting delegates from voting on their own proposals. Monitoring for self-dealing is done through random ballot sampling to maintain governance transparency and fairness. You can read it here: Code of Conduct - 📌 Policies and Templates - Optimism Collective
Something similar for xGov would be a good start to state what is legal and illegal. Because as long as it’s not written out, it is some sort of grey area where it’s decided by the individual itself whether it’s allowed (rather than the community and program decides)