I have no idea why people put word blockchain in everything, it looks like blockchain is a magic word that's used instead of Abracadabra, I wouldn't even be surprised if magicians say Blockchain while doing tricks. I think that increase mostly comes from former Soviet Republics because in these countries, a lot of people don't had access on PC and internet, there was DSL in most of these countries for a long time and we can say that fiber is new for them.
Also in some countries internet is expensive but at the same time there is a huge bandwidth usage because of pirate websites (multiple upload of different movies, games and etc for each website).
There are many reasons why people do that, people like to look like they are smart and one of the ways to do that is to use advanced terms that very few people understand like blockchain, another reason is simply something similar to what happened during the dot com bubble, even if you have one of the most unprofitable ideas in the world as long as you added '.com' at the end of the name of your business you were seen as a modern company and you could receive millions of dollars in funding very similar to what happened with icos.
right, appearance is the main to build trust, one of them is using .com, this is impressed that its activities are worldwide. but as a good developer, of course you have to maintain trust, so that it is mutually beneficial, unlike ico, which is a lot of fraud