number of full nodes, specially a number that particular site shows is not at all an indication of adoption, or number of businesses.
In my opinion, it is an indicator. It is not
the one and only indicator. For a better picture of Japanese reality one would have to perform an investigation on Bitcoin acceptance by shops. For me, the language barrier unfortunately is too high to do that.
The countries I best know regarding adoption are Germany and Argentina. In Germany (#2 on the node ranking) there is a small adoption, also by some online services like
Lieferando, but that has practically not changed much since 2013/14. In Argentina there was a little boom in 2013/14, mostly due to Bitcoin being then a relatively easy and cheap way to access foreign currency (from 2012 to 2014 foreign currency buys were extremely restricted, and until late 2015 there remained weaker restrictions). There continue to be services but very probably not more than in 2014.
There were other countries with more growth, but on a low level, and it's not justifying a 30x increase in price.
because first of all that number is reachable nodes whereas a lot more nodes exist but they don't accept incoming connections and sites like above will never list them.
That has low incidence on that stat, I think.
secondly is that businesses don't have to run a full node to accept bitcoin! it can be various ways, even a daemon using Electrum (an SPV wallet) can be used to receive payments.
You should only accept payments of low importance with a SPV wallet. Only a full node gives you the opportunity to not being scammed. Most small businesses, in fact, are using Electrum or even centralized providers. So a small number of full nodes should be an indication that there are only small businesses using Bitcoin, or that they are using services like BitPay.
p.s. i will never call bitcoin a bubble, near bubble top,... i would be disappointed if i do.
I have also not called "bitcoin" "a bubble", but many assets sometimes overheat, and I think with Bitcoin it's the case now, as it was 2011 and 2013.
My goal with this thread is also not to spread negativity. But there are many newbies that are thinking that they still can be rich with Bitcoin if they invest their savings. I think that's not the case and so I issued this "warning", to avoid to many people being burnt. Maybe I'm wrong and we go straight up to $50.000 but I think it's very unlikely.