Here is an interesting piece of information. Namesilo has recently released their statistics, which would have been a pretty routine update if not for an interesting breakdown of all their names (including new gTLDs) under management.
As of the end of October 2017, there were 1,116,107 domain names registered with Namesilo.
Out of 362 positions, there was not a single .hosting domain registered with them and only 28 .host domains, which places this TLD 253rd on that list.
While popular, Namesilo obviously isn't the size of a giant like GoDaddy that has 73 million domains, but it still gives an indication of .hosting and .host TLD popularity.