Assuming sBTC is launched with a hard cap ratio, this would enable borrowers to add to their collateral even if the hard cap ratio is reached. However, I have reservations about launching with a hard cap ratio. See topic here
Assuming sBTC is launched with a hard cap ratio, this would enable borrowers to add to their collateral even if the hard cap ratio is reached. However, I have reservations about launching with a hard cap ratio. See topic here