In my view they've changed the presentation of Plan a few times.
They had Maginot Lines, first just buy from Robinhood, then a "real" broker, then DRS (huge battle) , the Plan is great because better, than broker, then Book only...reddit mods who participated in any of that were complicit. If they didn't get paid for that self-compromise they're morons.
Sparkles might be both.
I still think Plan is better than broker, registered to holder and voting. But door is ajar and unlocked.
They fought every step: In a way that was a kind of a diagram by itself.