Having listened to the most recent Cycling Podcast episode, it appears that 56% of people who get an AAF for salbutemol don't have a case brought against them, so Froome is just about in the minority. What the total number is I don't know, so maybe the test does yield increased AAF hits in non-swimmers.
They seem to cover it fairly even handedly, even going into how much of a david WADA really is against sporting goliaths. There's also an interesting chat with Jonathan Vaugters (ex US postal in the Armstrong days, now head of Slipstream/Education first team) on all matters doping, dope testing etc. then vs. now. Well worth a listen
https://thecyclingpodcast.com/podcas...two-episode-23