my completely unevidenced and spurious theory:
Horner does some sleazy (but short of illeagal) stuff, Verstappen (defo senior, poss junior too) get wind of it, use it to settle some kind of grudge. Horner has some enemies back at RB HQ, who allow the smoke to smoulder into a fire rather than just squashing it straight away. Horner has lots of support at the RBF1 team (probably a big olde boys club) and it becomes apparent to RBHQ that if they bump horner, there’ll be a stampede of talent out of the door (including newey etc), killing the golden goose. Rest of the F1 teams doing ‘very concerned face’ publically about the need for transparency etc, while privately making big money offers to key RBF1 players. RB HQ now don’t want the house of cards to collapse so are trying desperately to find a way of making all this go away, but it might well be too late.