Watch Jim Sterling's video on this. There isn't even a remote chance that the FTC will act against a channel that is not exclusively for children and deliberately pretending to not be. That is if they have the time to act at all. The FTC is no danger at all here.
The only issue is youtube's shitty algorithm for flagging kids content which could lead to demonetization for certain videos, but that's nothing new. I mean it's hilarious that you bring it up in context of Nintendo because Nintendo itself is at the forefront of unjustly demonetizing videos of people. Nintendo is literally a bigger threat to creators than the FTC.
If you demand respect or gratitude for your volunteer work, you're doing volunteering wrong.