Maybe that is just a tactic to attract the European nations to use the cake wallet, but I really don't think it's anything useful and the targeted audience is very small. EUR stablecoins may be the cryptocurrencies backed by euro reserves,and one example that comes to my mind is EURC (issued by Circle). While the USD stablecoins that are dominated globally like USDT but EUR stablecoins marketcap is way less because they cater specifically to Eurozone users and businesses.
From what I've seen the EUR stablecoins are just like any other token the copycatcoin creators created. They needed something that is not the repetition of previous projects (ie. multiple USD stablecoins) so they created a EUR one instead. As we can see the firs-mover aka Tether is dominating the stablecoin market...
All this unnecessary crap... Anyway, I guess it's obvious what they are, I just thought that since they weren't already established, that they would never become a thing. Imagine how many stablecoins are yet to come... GBP stablecoin, JPY stablecoin, CHF stablecoin etc...