How many countries can access Wero now? Is that just EU or could other European countries also join? Switzerland, Norway, UK?

Wero is a European project, but non-Euro countries can definitely join. Currently Wero is being rolled out across the Netherlands, Belgium, Luxemburg, France and Germany. But and agreement has been reached with EuroPA. https://epicompany.eu/media-insights/bancomat-bizum-epi-sibs-and-vipps-mobilepay-sign-mou-to-accelerate-the-rollout-of-sovereign-pan-european-payment-solutions

Read this article. It will tell you more about non-Euro countries

Sigh… I’d sign up, but apparently it requires that my bank supports it, which it does not, so I cannot do that. :/