Then cash it out and put it in your bank. OMG.
> this might be useful for tax purposes,
How??
> payments
You can't pay for groceries.
> & donations,
Your donee won't be able to get groceries.
> or just to balance your portfolio.
But it pays no dividends, so it's not really part of any portfolio, and it's a poor man's cash.
> unlike fiat this has all the features of ERC20
And what are those? And can those be achieved in other ways?
> and self-custody.
What the hell does this mean?
> DAI, USDC and RAI are all fairly interesting
Oh, indeed!
> and make different choices and trade-offs to stabilize their price.
But I still don't know why you need this!!!
> all stablecoins do carry risk though; if you want a risk-free coin then just convert to fiat.
Oh, absolutely.
[addition]
I'm coming more from the BTC direction, where smart contracts are very limited. Then I really don't know what stablecoins are for. From an ETH direction, stablecoins might make sense as a way for smart contracts to operate on USD, assuming smart contracts are actually useful for something that can't be done better in other ways.