Given how broad the CFAA is, Instagram/YouTube could just try framing it as accessing their systems without proper permission, as the ToS disallow such usage.
How can you be sure that they “will not even consider” doing that? (That’s a disinformation from your side!)
If this app were to gain traction and start to be seen as a real problem by IG/YT, they would have all legal grounds to act. They can totally sue the app creator and they would very likely win the case under the CFAA.
How exactly is this disinformation?
It is speculative, but calling it disinformation is dishonest, especially since you then presented your completely unargumented claim that they somehow won’t even consider it. It is totally in the realm of possibilities and hence IMO something to keep in mind when considering selling this sort of app/service.