The original version works with touch, as well. (The same controls are used by the printed version, including the visual assets.) If you don't get the touch controllers automatically, have a look at the option menu (the stylized gear icon at the top of the screen).

Moreover, any game controllers should be supported (matching the usage scheme from the 1981 anniversary reunion at the Boston Computer Museum using Atari joysticks.)

https://truco.ba.net for truco or spanish card games

I wonder if that's on purpose. Or most people that might use this wouldn't care too much about the details?

There is some basic information to connect the peers. But we do not store any user info on ba.net. https://ba.net/screen/privacy.html

As of this is just a blatant ripoff of someone else's work.