I think your plan is sound; remove the 3D from the menu. I don't use them intentionally.
Ugh, it's gonna be harder to get away from proprietary maps than I thought. I removed all mapbox data from boydsmaps and am only using their API to display the 3d maps that I host myself. Turns out, everytime somebody loads one of these maps, it creates a billable event just because the Mapbox API is being used.

Was actually surprised, because I thought X wouldn't allow you to even view content without being a member. The same thing was also posted on other (sketchy?) sites, but they were all quoting the Twitter post.Looks like I will need to completely discontinue all HERE maps for everyone

I would just pay the $0.00 dollars to make sure they go away for good.So, here we are almost two years after discontinuing all the HERE maps and permanently closing my developer account.
Today I got this bill for my non-existent account, payable immediately.
Good riddance to these guys, I sent a message using their contact form to just leave me alone. I remember last year, they sent me a notice that the credit card for my non-existent account had expired. Just shows how hard it can be to get away from a company after deleting an account.