Because Neosurf is prepaid and deposit-only, buying a fixed voucher sets a hard ceiling on that session. A small number of brands advertise Neosurf withdrawals, but verification requirements on those are typically heavier.
A Neosurf casino is an online operator that accepts Neosurf vouchers as a
deposit method. Read the terms page once, properly, before you claim anything.
Daily limits sit between $1,000 and $5,000 depending on the operator and your verification tier.
References: https://toyvaulthq.com/forum/topic/how-to-spot-dodgy-best-neosurf-casinos-australia/