The distro I find easiest to recommend to folk in my life looking to move to Linux is the distro that I'm using/most familiar with, because it makes it easier to help them out if they run in to an issue.
I use CachyOS, and previously, I was trying to support Mint etc, but having zero experience with the way the way Mint handles packages, with its default apps, update process etc, I found myself having to research an OS I don't use, and offer 2nd hand advice. I moved them over to CachyOS, and even though technically, it's not as beginner friendly, my day to day familiarity with it meant that it was easier to help out when troubles arose.
On the chance that you're engaging honestly, rather than just trolling...
WhatsApp, Roblox and Signal all run fine in Linux.
This is the ProtonDB page for Roblox. https://www.protondb.com/app/2181790. ProtonDB is a database that assesses how well windows games run under linux, and in this case, Roblox is Gold rated.
There are numerous WhatsApp apps and wrappers that run under linux, and Signal has an official Linux version found here https://signal.org/download/linux/