WebR - R in the Browser

Some browsers (especially mobile browsers) may place restrictive limits on the amount of RAM provided to WebAssembly regardless of the amount of memory available on the host device.

Yes, because it’s generally not great to require other apps to be killed, or to cause your own page to be cycled, due to using more memory than is available. Desktop systems generally either have huge amounts of ram or can swap. mobile devices operate under different constraints than desktops, and complaining about that simply indicates a lack of awareness about the systems and pettiness due to failing to understand that.