Wow, how desperate this browser is if it tries to encourage people to introducing a built-in wallet. No kidding, though, I think it's a great idea if it turns out to be safe to keep eth and tokens in such a wallet. Opera is one of the top-5 web-browsers, so I suppose a lot of people will be introduces to cryptocurrencies through this built-in wallet. Unfortunately, I couldn't find information about the number of users, but of all the people who use web-browsers Opera users are about 2.5%. As the estimated number of Internet users is 3.2 billion, around 80 million people use opera and will probably hear about cryptocurrencies. I suppose only a positive effect can result from this.