Well, I had to change the system country and managed to install it.
But it is awfully disappointing. It is an Electron app, which means that
* It brings with itself the whole standalone Chromium browser, and takes 286 MB drive space
* It does not follow the system theme style, except the dark/light mode.
* It does not use the system fonts: neither sybpixel smoothing, nor the font family, nor the color. It uses grey font on
white background, which coupled with greyscale antialiasing makes the font unreadable (as opposed to my system theme which uses black font on white background). In dark mode it uses the same grey font on black background.
* Everything is gigantic and uses a lot of screen space, which is precise on a laptop. It looks like it is designed for a phone with touch interface.