Thank you and good evening . . .
All clear and unexceptionable.
However the user may wish to change - among the proposed search engines (ahem... imposed) - only the domain from google.com to google.es or .fr, or .it only to have a better territorial response in the query results.
Always using google, the risks to the user of incurring malware/adware hijacking, would remain the same, indeed, it would certainly be minor to that in which the user could incur, installing for eg. an extension not previously checked by google. As sometimes happens. . .
The gain of Opera for the use of the search engine would remain unchanged, I think, because the user will always use google, but the user would have a service more targeted to his needs.
I hope I was clear.
Greetings . . .