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Do you use unofficial apps related to Pokémon Go? We have already told you about them on occasion but now they seem to have a problem because apps like PokéVision, PokéHound and other apps have stopped working.
If you try to access some of the ones we have mentioned you will find that they are not working right now, in fact many of them will cease to exist forever due to quite logical reasons related to the creators of Pokémon Go.
Possible reason: the Terms of Use have not been respected
Both PokéHound and PokéVision and other similar apps, both that you can find in the application stores as websites, have been forced to stop providing service and therefore to close.
You may still find a working utility such as PokeRadar, although it looks like they won't be shutting down soon either due to that Niantic, the person in charge of Pokémon Go, would be contacting the creators of said services and apps.

The reason is quite simple and it seems to have to do with the Pokémon Go Terms of Use have not been respected, something that has led to everything we are telling you about right now.
Although no one has ruled on it, this type of apps and websites break the magic of Pokémon Go since the essence is to leave to look for pokémons and not know in advance where they are and the time it takes for them to leave a specific place.
It is therefore quite logical that in the next few days all those applications and services that take advantage of the features of Pokémon Go will stop working again. definitively as it seems that some have already done.
Were you using PokéHound, PokéVision or similar apps?