the point is that it doesn't have to be that way. and the examples in other countries show that it is indeed not like that everywhere. it is a fair question to ask which way is better, and looking at other ways to respond to these cases is relevant in my opinion.
It doesn’t have to be that way but it is and won’t be anything different until many variables change. As far as this case is concerned: no there is and never will be due process for this situation nor does any UK law allow for that.
Maybe the user could make an argument in court that Facebook was hurting his business but hard to prove with a free service. No real harm has come to this person.
Usually a “losing access to customers” argument is tied to loss of capital to make the argument stick. It is harder to tie a customer to loss of capital in a free service. Especially a free service that isn’t the only offering.