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I saw that Stencils arts are no longer generated, what happened so that they are not eligible?
Stencils have never been eligible.
I separated 3 examples and they exist in the Portal Network.
Existing portals are not an indicator about if something is valid or not.
Many have been approved with different rules, other might have been approved against the rules and lastly asking a generic question like "stencil" will get you the answer that I've provided as most of them are temporary, done in a minute and they can be erased at any time as vandalism.
There's a quality threshold they need to reach, because they need to be "Unique Art or Architecture", which the Banksy rip-off in your first picture is not. If you'd submitted an original Banksy, then that would be a different matter.
I would consider each one on it's own merits. Not all stencil art is created equal. That said, I am very careful before accepting one's on utility boxes. Utility box art, like Stolpersteines, have become the 'go to' for fakers here in Europe.
Or 'Kunst am Stromkasten' in Germany. :( I got these real Stolpersteines also in my town :)
Eencontrei 4 Stencils Arts perto da minha casa, duas no chão, uma no poste e a outra na parede, esses 4 serião um bom candidato?
Onde eu moro não tem cultura artística, só uma Arte Urbana Romero Britto, a única arte do bairro.
It would not be in Niantic's interest to encourage vandalism.
No, those all appear to be simple vandalism, and in the case of the last three, I would venture to guess that they were created specifically for the purpose of submitting as a Pokéstop (and hopefully rejected).