Yes that's about right. RPGM is great for people with zero coding skills and who just want to make a game with little attrition, but that also makes it pretty limited. For me it was very worth it, but there's a reason I'm using a professional engine for the next game xD
And oh gosh... Unfortunately playing in the browser has these risks.
Recently I learned you can even play the PC version on mobile with an emulator. I wonder if I should tell people playing the browser version on mobile that.