The best replacement for newshosting is giganews.

The best alternatives to newshosting are rated as following:
★★★★★  giganews
★★★★  astraweb
★★  usenetserver
★★  supernews
★★  newsdemon
★  easynews
  usenet

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Speaking about newshosting, one probably shouldn't forget about sickbeard.

Other search terms related to newshosting and their ratings are:
★★★★★ sickbeard
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Google Trends

Scale is based on the average worldwide traffic of newshosting in all years. Click on graph for more.
newshosting
giganews
astraweb