For legacy RSS Proxy urls, feedless will provide error messages if it thinks this is relevant for you. Those errors should only appear once a month.
Feedless is the successor project of rss-proxy. If you use one of the provided rss-proxy services, you will get a deprecation warning. At some point I want to disable that feature, cause it is incompatible with the direction I want to head in. I plan to provide a simple migration path to import those urls in feedless.
