Two PokéStops that had already been accepted four years ago were removed. Why all of a sudden?
From what I can see, it looks like they are on single family private property (that’s not allowed)
Welcome to the forums 
Sometimes, ineligible wayspots get accepted by reviewers. If they later get spotted by someone who reports them for being on SFPRP (single family private residential property), it is easy for Niantic to agree with the removal report.
With the new Wayfarer map, anyone who happens to see a live Wayspot that shouldn’t be one has an easy way to report.