What are the benefits of using those sites?
I’ve heard Yahoo! is good for stock market trading and financial news, but haven’t heard anything else about any of them.
The reason I use Proton is to have a unique email for every account that cannot be used to find my original email address, and that I can delete at a moments notice if said email somehow gets on a spam list. Nobody except me knows my main account email. The + method does nothing for me.