This is all about how tv rights money gets split.
Big clubs don't like sharing the money (as they believe it's them that create the value), and also not getting any when they fail to qualify for the CL.
To understand this all you have to do is go through the history of how CL TV rights money has been allocated over the last 20 years or so.
Remember that every team is immediately awarded the same amount when they qualify for the CL (before performance payments kick in).
Then there is the market pool which was introduced to give a lot of the tv rights money to the clubs from those countries. This used to make big clubs from the big countries unhappy because they felt the, as an example, the turkish tv rights money was earnt by them and not turkish teams.
They then moved a lot of the market pool money to a payment that is allocated by uefa coefficient and paid the top 32 clubs. 32nd would get 1 share and 1st would get 32 shares.
Seems the big clubs which have pushed for these changes are still unhappy at sharing the money.
https://www.football-coefficient.eu/money/
The top premier league clubs are also obviously secretly unhappy about how evenly the PL TV money is split, although they won't say it out loud.
Thank you for doing the research, as you discovered the money share is already extremely biased towards the bigger clubs and leagues.
The question is money wise at what point do they become happy? 90% share? 95%? 99%? 100%?
You are right about the EPL as well and slowly overtime that split is been changed e.g. the new oversea rights deal has a larger amount going to the teams who finish higher up.
These clubs should realise a more even money spread creates more competition which creates more excitement which creates more revenue, however I think short termism is king here, and they just want that bigger %, even if it means making the league like the SPL with absolutely huge competitiveness gaps between the giants and the rest.
This season we have West Ham and Leicester competing for CL is that a bad thing?
Leicester won title in 2016, a bad thing? Apparently this was the catalyst for talks.
Same with Blackburn earlier on in the EPL.
Makes you wonder what would happen if someone like Arsenal got relegated.