That's great, right up until Ring unilaterally decides to give the police access to your videos without a warrant, or when the police use a warrant to grab video from ALL of your cameras, even if you've already complied with their request, and the video is not relevant to their investigation.

Exactly. There are legitimate concerns about whether law enforcement should be able to subpoena "third party" records (including video recordings) with a process less than a full blown warrant supported by probable cause, as determined by a neutral judge, or whether government should be able to compel the retention of records for a later after-the-fact search. That's a discussion worth having.

But voluntarily recording and retaining video means that the person who controls those records can choose to do what they want with it. Imagine if some homeowner had these cameras, and had their own home burglarized, and tried to turn over the video evidence of the crime, but the courts were like "whoa wait did you get a warrant for that?" It doesn't really change anything to have it be cloud hosted, or easily shared with a button, because that "share" functionality works for non-police recipients, too. Doorbell camera footage gets shared all the time on social media, sometimes because it's funny or interesting or otherwise worth viewing.