Perhaps a good starting point is spending a few minutes investigating how bitcoin works, perhaps with ChatGPT as a resource. You should attempt to understand it before forming an opinion and asking leading questions.
Bitcoin uses a UTXO model, a recipient address is specified for the remaining funds that are not intended to be spent. Similar to how you pay for a $20 item with a $50 note, you (recipient) receive $30 in change.
Bitcoin uses a UTXO model, a recipient address is specified for the remaining funds that are not intended to be spent. Similar to how you pay for a $20 item with a $50 note, you (recipient) receive $30 in change.