Thanks for sharing this! Here's what I think about this app:

Pros:

• Being Open Source means the user-base would have a say on improvements for the app through contributions. This could push the app/product to become more tailored for the user's needs.
• Splitwise removes the hassle and friction of borrowing money between people.
• Partnerships with PayPal and Venmo enables added features like being able to get reimbursements.

Cons:

• May not work on some cultures and could be offensive too, but this is all based on how the user uses the app.