Looks like you had a nice influx (of a lot of brand new butts!)
https://ssb.picoreclame.nl/Map%20of%20the%20network%20with%20popular%20names.jpg (warning: large file)
I have looked for an alternative server without much luck...
There is no alternative, AFAIK, but you can install an earlier and more stable version:
$ npm install -g 'firstname.lastname@example.org'
You can set e.g.
NPM_CONFIG_PREFIX=~/.npm-global and include
$PATH to avoid installing and running the damn thing as root.
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