you don't put these SIMs in phones, these go into dedicated devices with very limited functions that pretend to look like phones to operator, dozens per. it can work like a proxy with massive number of outputs
stuff like this https://www.vice.com/en/article/video-ukraine-busts-alleged-russian-bot-farm-using-thousands-of-sim-cards/
also, presumably lots of these cards got burned quite fast, so not all were active at the same time, and some were spares
once is happenstance, twice is coincidence, three times is enemy action. were all these apps vibecoded?