In addition to the (good) response of kodlu, let me clarify a point which, I think, is the source of the confusion.
Springer, IEEE, Elsevier, etc, are publishers. What this means is that they are responsible for the edition/printing process for journals and conference proceedings. Since they do the publishing and sell the resulting journal, they put their name on the book they produce. That's all. If you create a new conference and want them to be the publisher, they will happily do it if it is financially interesting to them.
The publishers play no part in the selection process of the papers to a journal or a conference. For peer-reviewed conferences, for example, there is a program committee: a list of researchers which have been contacted by the program chair, and who volunteered to participate to the selection of the paper (it's a huge work, for which they are not paid). The program chair is the head of this process, who chooses the committee and makes the final decision.
There is no formal ties between the publisher and the chair/ the committee members. The publisher is a company that sells its editing abilities. The chair and the committee are researchers doing this work for free because it is beneficial for their community (and/or their CV). The chair is typically chosen by the researchers themselves.
For example: CRYPTO, EUROCRYPT, ASIACRYPT, TCC, PKC, etc are some of the major cryptography conferences. The publisher for the proceedings of these conferences is Springer. However, everything related to the scientific content of these proceedings is handled by the IACR (International Association for Cryptographic Research), of which cryptography researchers are often members. The IACR will choose the next program chair (e.g. during a board meeting, then officially through a vote that takes place during one of the major conferences), who will construct a committee, who will read the submissions and recommend whether to accept of reject.
The important bottom line is: there is zero correlation between the quality of the content and the publisher. If EUROCRYPT, CRYPTO, PKC, TCC, etc are serious conferences, it's because they are handled by the IACR, which is a very serious research organization (it is the association of researchers in cryptography). The fact that Springer is their publisher says nothing about their quality. Springer can be the publisher of dozen, perhaps hundredth of very bad journals, perhaps even predatory journals. They do not care, because assessing quality of the content is just not their goal. They are here to provide a service (edition, printing) in exchange for money.
