When I got my first Raspberry Pi (4B), I was kind of shocked at how hot even my passive Argon case would get. Though I am guessing a more powerful and efficient ARM or RISC-V CPU would not spike to 100% so fast. But when I got my Pi 5 I made sure to get the official case that came with a fan while I waited for the more powerful active cooling fan to release. So much better at running stuff like YouTube or other media without hitting thermal issues (got the active cooling Argon One for my 4B with similar results too).
Having more powerful ARM/RISC-V CPUs that can actually handle stuff I expect a full on laptop or especially a desktop will be awesome. But while we are in the "still not as good" period of these CPUs both matching x86_64 and programs for them being full versions. The inefficiencies of either needing emulation or just very un-optimized code as devs are getting the hang of ARM/RISC-V coming from x86 mean those temps are easy to hit.
At least it should still work with the hard coded sponsor spots that are actually part of the videos (like the "brought to you by Manscaped" or whatever).