Had to experience that first hand. I tried to get my best friends to register on my Matrix server last September and join a room for our group, and they did, but I rarely see any of them online and I only get responses days later, if at all. One even stopped using it entirely, lol. Ah well, but at least I got a Matrix server out of that that I can use to federate with other like-minded people.

Can you not just run the curl or wget without piping it into bash, first? This way you could inspect what the script wants to do.