An emulator is a piece of software and can't make assumptions. I'm not sure who you're referring to doing the assuming in yourOk, fellow pedant! By dumping and decrypting the ROM, one is breaking the license agreement. And these ROMs slip into the wild. You've read the EULA? It's DRM circumvention. You don't need to like it. No skin off of my nose, but this isn't a John Deer right to repair situation.
1. License Grant/Restrictions; Third-Party Content.
Subject to the terms of this Agreement, Nintendo grants you a non-exclusive, revocable license to use the Software solely on the Console for your personal, non-commercial use. For clarity, the Software is licensed, not sold, to you, and you may not make use of the Software except as expressly authorized by this Agreement. Without limitation, you agree that you may not ( a) publish, copy, modify, reverse engineer, lease, rent, decompile, disassemble, distribute, offer for sale, or create derivative works of any portion of the *Software;*
NA EULA, perhaps different in your country - https://en-americas-support.nintendo.com/app/legal/a_id/6858...
Nintendo has no legal entitlement for their business plan to work financially.
Their lawyers will craft it. See ya!