There's a similar situation in Switzerland, where a handful of banks dominate the national market despite some smaller (cantonal) options that mostly have their own consortium anyway. The larger banks cooperated on creating a mobile payments platform known as TWINT [1], which allows for fast and free individual payments for splitting the cost of a meal, private sales, or even many in-store transactions. This allows them a competitive advantage over alternatives such as small Swiss banks or foreign banks that the many non-Swiss residents in Switzerland may otherwise continue using. These other options are relegated to IBAN transfers which are notably less convenient.
[1] https://www.twint.ch/en/