There are two, perhaps three issues here.
Farage's case is very different to others mentioned.
There is a tidal wave of turds following him around like a bad smell relating to money laundering, unexplained wealth and Russian disinformation and political interference - his known associates keep ending up in courts.
Farage is piggie backing on other concerns that others ordinary people have or can relate to to distract from his legal and financial irregularity question marks.
This is well established and about risk management for banks about their exposure to criminal activity. It's a legitimate legal issue not a freedom of speech or an abuse of power issue.
You then have freedom of speech issues which I'm not entirely convinced of. There should be oversight on this and questions asked but I remain unconvinced by the argument.
And then abuse issue which often I think are more to do with appalling service by banks and a deliberately obstructive approach to make complaints as difficult as possible to uphold. It's easier to push customers to breaking point than to deal with a problem and have to declare it to financial regulators. There is a need for oversight on this.
Don't conflate the separate issues.
Farage MO is to deliberately conflate and confuse matters for his own personal advantage.
I don't agree with his view but think he should be allowed freedom of speech. However this isn't a freedom of speech issue for his case.
The history of Farage's issues with dodgy financial issues are well documented and in the public domain.