Uhhh, Netori isn't NTR. Netorase is because it is a subgenre of NTR (Netorare), i.e. the "Ne-to-ra" part, as it is just NTR but the MC is into it.
Netori is a different thing altogether.
And is only tagged with cheating on F95, as for elsewhere it is just Netori, unless you are spastic like nhentai and don't know the different between such tags and just tag everything as Netorare.... despite having the cheating tag XD
As for the "three types of NTR" that is more three main methods, being cheating (type A), rape (type B), and then rape leading to cheating (type C).
There is also Reverse-NTR where MC is the one being stolen. (technically Netori is also Reverse-NTR, just reversing a different aspect, but it already has a name so reverse goes to MC being stolen).