Hi DavidR,
You are welcome,
With so many websites, there could also be so many reasons for blacklisting.
In this case it could have been bitcoin blacklisting.
In other cases there could have been copyright infringement (illegal grabbing of copyrighted material)
and there could also have been various other reasons (abuse).
Anyway, it is a reassuring idea to have it checked for false positives, as we advised here.
As said Vietnam is a relatively recent player on the Interwebz, good thing avast also overseas this theatre.
Have a nice day,
polonus a.k.a. Damian