@YkBonsai: Spagnum moss is not used for decorative purposes on bonsai at all or - the moss that is used for decorative purposes is not sphagnum moss.
Sphagnum moss is used for other purposes and can be beneficial.
crataegus.com/2012/07/05/the-moss-myth/
@Spacewood:
I am quite familiar with these videos. There were more than 250 videos. I've seen a lot of them. Not sure why, it make me cringe to see how this man treats his plants. The videos disappeared some time ago, but it seems the author had a backup and is placing them back. Unfortunately. Here's a topic I wrote about it long ago:
www.bonsaiempire.com/#18610
I cannot recommend watching this series. The method isn't easier than regular bonsai methods, the method probably is not at all suitable for your climate and the demonstrated results are pretty bad.
Unless of course when you
think this is perfectly OK (go to 5:05)