On 1)
Instead of the current text state the outcome:
If you have 5 npubs selected “follow 500 of these people’s follows contacts”
If you have 3 npubs selected
“follow 300 of these people’s follows”
Discussion
Things are a little more complex. When you select some people, their contacts are merged, randomly shuffled and then capped to 500 (too avoid a too long list). So I cannot just show the count; with one or two contacts, the max is already reached, and the user would find the thing weird. I could find out an alternative way (e.g. 100 random contacts per user), but I don't think we have any big blocking issue here (indeed, giving the count might raise doubts about who to select and so create friction), and anyway it is temporary.
How about a real
Time “follows counter” as you opt into to copying follows.
Each time you hit “follow follows of npub” the follows counter increases by 100, or whatever you math returns