Open source does not mean "I take random projects, integrate them into my product, without any credits, without any acknowledgments". It means "I take projects, integrate them into my product and follow the minor implications of the license"
For example the MIT-License has a rule:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
And as far as I can see from this article, there was no acknowledgment. According to tldrlegal (Sadly don't have the time to read through the entire AGPL license): https://www.tldrlegal.com/license/gnu-affero-general-public-..., you have to include the license and copyright
For example the MIT-License has a rule:
And as far as I can see from this article, there was no acknowledgment. According to tldrlegal (Sadly don't have the time to read through the entire AGPL license): https://www.tldrlegal.com/license/gnu-affero-general-public-..., you have to include the license and copyright