The character of Black Widow already has his solo film within the Marvel Studios Cinematic Universe and it is a total success.
Black widow is movie number 24 of Marvel studios, a franchise to which for now we must also add 3 series of Disney Plus. When you think of the credits for all these installments, fans often make mention at the end of the movie. Especially since it is a long-awaited moment since there are hidden scenes that usually anticipate the new that is to come. Also in this particular movie, what we can see is very important.
But there is an exclusive club consisting of three films that also have credits at the beginning of everything. In the case of Black widow, also has a narrative purpose by filling in some of the gaps in the origin of Natasha romanoff (Scarlett Johansson) and accompanying a prologue in Ohio in 1995. While the rest of the plot takes place just after Captain America: Civil War (2016). But everything we see in those initial moments will be very important throughout history.
The club is made up of three films.
In addition to Black widow, there are two other films that have credits at the beginning, it is about The incredible Hulk (2008), which is considered one of the worst films of Marvel studios and the one with the least collection. Since it only made 264 million dollars worldwide. But you also have to add to Guardians of the Galaxy (2014) of James Gunn. So there are really 3 very different installments, so adding these credits at the beginning should not obey any specific criteria, but will depend on the indications of the creatives.
It is curious that such an exaggeratedly successful franchise does not have certain guidelines to start with. You can see how all the movies and series already released start in Disney Plus, even Black widow, but for now it has Premium access.