As mentioned on the governance channel on Discord.
Users predicting the outcomes of the markets using a stable currency without having to worry about fluctuations in the market price of ZTG is a good idea. It's something users have been asking for since the beginning of the parachain.
USDt for 1, the use on prediction markets is kinda obvious and the most wanted feature for many.
For point #2, it makes sense as long as it's used only as exchange and the real fees are kept in ZTG, at the parachain level. In such a way in the event of a stablecoin depeg, the ZTG would still maintain the fee structure within the parachain.
About point #3, it's not too convincing. Governance, disputes and market creation are a core function of ZTG and that should be respected. Moreover, it not only exposes governance to the stablecoin depeg risk of the coin but also exposes the governance to opportunistic deep pockets who would not even need to use the ZTG to attack the parachain governance.
Thanks for sharing your thoughts @SAXEMBERG. In regards of point #2, just to clarify for everyone, the advantage of allowing transaction fees would be to enable providing liquidity or trading on Zeitgeist by solely owning USDT, potentially attracting a user base that is not willing to hold ZTG. In that case I agree that the USDT should be converted to ZTG and put into the treasury.