That is exactly what I said: I cannot include Fastcraft because of the license issue, so I can only recommend it but not include it. This however is rather annoying for the users of the pack and many are either not reading that part or it is too annoying/complicated for them to do.
I do not choose a launcher for my pack, I can select one of those available. This is an important difference, because I cannot make sure that a launcher will have the required options and I especially cannot make sure that a launcher still has such an option in 1 year. So if I have to limit my options just because of one mod, that mod won't be in the pack.
Yes I did, but you are obviously not a legal expert.
"The download and the way to get there must be free of charge and ad free"
Free of charge I can do, but ad-free is beyond my abilities if I host that mod let's say on Curse, because it is up to them to decide whether there will be ads or not. And again I cannot guarantee that it will be ad-free now or in the future, so I cannot include Fastcraft again.
For once have you considered that this is not my job? I might have other things to do or be on a business trip for a month or two, or even just have vacation somewhere, where I can not check this. And then the license also says that I would be forced to include the latest Fastcraft version even if that completely breaks the mod-pack. So again, as the license is very strange here, it is better to not have it in the pack in the first place.
Here is another theory: I am an expert on software development and project management and just know a lot more about licenses, legal issues, update hassles and potential pitfalls than you are even aware of. And because of that my request is actually very valid. The fact that most other mod-packs do not include Fastcraft for the very same reasons is a good hint that the license as it stands right now is probably not very fitting.