Here the fact of the stability of the coin is important. That is, the team must have enough own funds to support the exchange of coins for altcoins at a fixed rate.
This stability to ensure a kind of "gold reserve " in stable coins is achieved due to the presence of the company's insurance reserve Fund in banks.
in any case, there should be a backup plan, for example, when a token falls in price or some circumstances in terms of investment, a reserve fund is necessary for any project