In the early tests in Australia there's already a lot of complaints about noise. Making the flights quieter is already becoming a higher priority. https://www.engadget.com/2018/12/27/alphabet-quiet-wing-deli...

Privacy is also important, but it's a separate issue. Is there anything that can be done via drone that can't be done with a cell phone or a go pro? It doesn't make sense to outlaw hammers just because they can be used for murder.

edit: allow to outlaw