Pretty sure you’re mixing up Beeper Cloud with Beeper Mini.
Beeper Mini is based on pypush, which they’ve bought, and is clearly using spoofed data in the data.plist[0].
I’ve searched, but I’ve found no mention of them purchasing Mac Minis en masse to support the $2/mo Beeper Mini customer’s texting habits.
Besides, it wouldn’t make sense anyway because they used to tout you didn’t need an Apple ID and instead could use your phone number, and non-iPhone IDs don’t allow for iMessage activation on phone numbers, only email addresses.