The thing is these footballers support causes it doesn't mean they will put their careers on line for that cause. Someone comes knocking on your door to promote a cause, you may want to help them in different levels. You might make a one of donation small medium or large contribution, might pay a continuous payment on a monthly basis. Might want to go out and volunteer for the cause. finally if you are all in you might want to implement can make changes in your lifestyle and leave a will for them.
A contribution of us giving a £5 might mean more to these highly paid footballer it doesn't mean they are all in. I said this at the time of the world cup all in for me is Mohammad Ali. He believed in something that he gambled his peak years, he risked his career, money everything. If the likes of Henderson and Kane were remotely all in they would have refused to go full stop that would have been a big statement. But no they want to help the cause but not threaten their career and ambitions which for me is fair. Like someone coming to my house, I like the cause make a donation.