I’m genuinely asking and don’t mean this the way it sounds, but is this supposition or have you observed this yourself?

Yes, and I’ve been building social media message systems since 1984, and I’m a published author on messaging systems. I described some of the data integrity and sever malfunctions on multiple systems that have small to large numbers of users, including my own system on Oracle Cloud that has only me as a developer/user. Example of how it is failing: https://lemmy.ml/comment/616698