Is it obligatory to dispose of the Bank Misr interest that was acquired in ignorance of its prohibition, or is it permissible to keep it as compensation for that ignorance?

If a person repents from earning unlawful money while being ignorant of its prohibition, some scholars are of the view that their repentance is sufficient and they are not required to give away the money. They base this on the Almighty's saying: "So he may keep what is past, and his affair rests with Allah." Although the verse was revealed in the context of usury, it applies to a Muslim who was ignorant and excused for their ignorance if they repent. Ibn Taymiyyah stated that whoever seized unlawful money and was unaware of its prohibition, then later became aware, is permitted to consume it. Accordingly, there is no harm in benefiting from profits earned before knowing their unlawfulness, provided one refrains from dealing with usurious banks thereafter.