It is 48% of all:
Local revenues, including gate receipts, local TV revenue, concessions, parking, sponsorships, etc, and the funds are then divided equally among all 30 teams.
From this article: https://www.blessyouboys.com/2021/12/16/22831008/mlbs-revenue-sharing-problem-and-how-to-solve-it
So the merchandising should still pay for most of Trout's contract which would be something like Trout's contract minus whoever they dump on the Angels or a third team probably Castellanos. Each team gets about $100m a year from the shared revenue fund. For a team like the Phillies taking on Trout's contract and removing one of their other higher priced free agent signings shouldn't be an issue. This is also not taking into account the national revenue that the teams also get which is about $90m per team and also the sale of the MLB.tv technology that each team received this year. I believe that was about another $90m per team.
I don't see adding salary being an issue for the Phillies their revenue streams for merchandising and others are already strong. Bring in someone like Trout who is from the area and you probably have a really easy marketing platform to sell enough jerseys, shirts, hats and other things that people will buy up.
Back on topic now and I believe the Angels have finally realized they are not going to be competitive with their current club and are finally doing a tear down. This has probably come about three years to late. I don't think they had to trade Trout or not go after Ohtani but signing Rendon was a mistake and it was a mistake at the time they did it. They haven't figured out free agency and they have gone through a few GM's trying to do everything through free agency without actually knowing what they are doing. There is no team identity with the Angels and it shows with the on field product. There isn't a focus on anything other than target whoever is the big name free agent for that year. Moreno hasn't figured this out after going after Hamilton, Pujols and others. It has been one big line of horrible free agent signings that Moreno has been apart of. You can't fill all of your holes with free agents you have to be able to develop, trade and sign free agents not just one but you need to do at least two of the three and the Angels have failed at all three with Ohtani being the exception. The Angels did make a good trade last year with the Phillies acquiring a really good catcher for a middle of the road OF in Marsh.
I don't expect the Angels to get much back in return for Trout as the number of suitors for Trout is a handful of teams at best. Some of the large market teams may also be hesitant on spending more also. The best option really is the Phillies but that means either getting buy in from Castellanos or someone else in waiving a no trade to the Angels or getting a third team involved. If the Angels don't want to take salary back then they are going to have to pay for a significant amount of Trout's contract and would be in a similar situation as the Rockies were with Arendao.