We have clarification on cemeteries here, and most are not eligible.
I personally have had some Wayspots at cemeteries removed, especially since they’re at ones still in use.
We even have clarification on restaurants:
Trail markers encourage exercise and exploration, and old ruins may be worth exploring. Tile art on a wall may be considered unique art, and may meet the exploration criteria.
Street signs are not homages, they are navigational signs, letting you know where you are in a certain town/city. Most of the streets where I live are just numbered, such as 15th St or 25th Ave. There are a few named streets, but not many. Even Main Ave here just has regular street signs, nothing special to note you’re on Main. We also have streets and neighborhoods named after people and geographical features, but again, the signs are the same or similar design, and most people today might not even know who or what the they’re named after. Some neighborhoods are just named after the schools in the area.
Wayfarers in different areas of the world do see what is and isn’t eligible differently, but at times, an area may get cluttered with things that aren’t eligible. Street signs are part of infrastructure, like the streets and roads they note you are on. Infrastructure is usually ineligible, as you see it all over the area where you live. Because of this, Niantic is removing street sign Wayspots in Portugal for not meeting criteria.
BTW, @Siinnie is an ambassador from the Portugal area, so they are aware of what is and isn’t eligible there, as well as why these street signs are being removed.