Let me guess… You’re running an X.Org based WM/DE?

X11 Doesn’t support fractional scaling properly . So some DEs will simulate it by scaling the apps the same way you scale a rasterized image like a PNG or JPEG, and as a result everything looks blurry. You’ll generally also have the same issue with XWayland apps on a Wayland display.

The best way to combat this? Try to use Wayland native apps as much as possible.

2nd best? Use non fractional values for scaling (x1 or x2 instead of x1.25)

That’s the case for pretty much all systems that use widevine - you can blame google for it, as they are the one that built the widevine DRM that all streaming services use