From NixNet
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As this service is often abused, Iwe've had to add some rules. As more issues arise, more restrictions will be added.Accounts in violation of these rules will be contacted ''if the user has contact information listed''. If they do not, a backup of their feeds will be created and their account terminated. If your account was terminated, [ contact us] and we'll send you the exported OPML file that can be imported to any other TT-RSS instance. 
#Subscribe to no more than 200 feeds