Can I use photos found online in the mobile app?

There are many mobile apps that use pictures. For example a very popular "4 pics 1 word". Want to try coding for mobile platforms and for the test project selected similar to the above app. Naturally, I want to place it in stores. If the photo has no watermark, no signature of the photographer, then can I freely use it?
October 3rd 19 at 02:14
2 answers
October 3rd 19 at 02:16
Solution

No. The presence or absence of watermarks in no way determines the conditions of distribution of the image.

October 3rd 19 at 02:18

There are free image banks that can be used according to their licenses. I am absolutely sure that there are those that can be used for commercial purposes.

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