I think this is a great initiative, I love using bunq but currently, if I want to do any sort of investing, I need another financial service provider to do so. This means that bunq basically isn't very suitable for storing your savings, unless you don't mind not getting any interest on your money.
Wouldn't it be great if we could easily put (parts of) our savings into ethical/sustainable investments from the app, perhaps even with the option to put in or withdraw funds periodically? It's probably best to do so by partnering with other financial services providers that already offer such services. This way bunq can keep focussing on what it does best: building awesome software.
This does raise some questions, like who decides which investments are ethical/sustainable? Bunq? And who carries the risk (and reward) of the investment? It seems logical to me that he who decides to invest his money also takes on the risks and rewards.
A great first step I think would be to partner up with a service like BUX or DEGIRO and give bunq users the possibility to put (a part of) their funds into a small selection of ethical/sustainable investments. Don't forget to properly warn users of the risks and of the transaction costs of investing.
I wonder what other possibilities people come up with. Keep up the good work!