How can one save and avoid spending money given the doubts surrounding the investments of Islamic banks and their similarity to usurious banks?

The crucial factor in naming Islamic banks is their commitment to Sharia compliance in their transactions, and that this commitment is overseen by a board of trustworthy scholars. One must be wary of rumors that attempt to undermine these banks. The questioner should examine the bank's regulations and system and inquire about it with people of knowledge.