According to Deadline:
Marvel Studios president Kevin Feige won’t produce any further Spider-Man films because of an inability by Disney and Sony Pictures to reach new terms that would have given the former a co-financing stake going forward. A dispute that has taken place over the past few months at the top of Disney and Sony has essentially nixed Feige, and the future involvement of Marvel from the Spider-Man universe, sources said.
This comes at a moment when the last two films Kevin Feige produced broke all-time records — Disney’s Avengers: Endgame became the highest grossing film of all time, and Spider-Man: Far From Home this week surpassed the James Bond film Skyfall to become the all time highest grossing film for Sony Pictures.
There is a lot of webbing here, but it all comes down to money, and it’s easy to understand why both sides refused to give ground. Disney asked that future Spider-Man films be a 50/50 co-financing arrangement between the studios, and there were discussions that this might extend to other films in the Spider-Man universe. Sony turned that offer down flat. Sources said that Sony, led by Tom Rothman and Tony Vinciquerra, came back with other configurations, but Disney didn’t want to do that. But Sony did not want to share its biggest franchise. Sure Disney would be putting up half the funding, but the risk is in how much you are going to make back in profit. Disney wasn’t at all interested in continuing the current terms where Marvel receives in the range of 5% of first dollar gross, sources said.
However, When contacted by io9, a Sony representative said it’s their belief this dispute is simply over a producer credit and negotiations are ongoing. They further clarified that Feige has contributed to other Spider-centric movies that he did not receive a producer credit on. Other sources tell us the Deadline story is completely accurate.