Some of them were certainly serious men ~ and a lot of them were simply churches with one member, and him not all that reliable.
That aspect of Christianity disappeared after the islamic conquest of North Africa.
That's most of a thousand years before Protestantism came along.
Here's where I remind everyone that all the early Protestants had been either Orthodox or Roman Catholic Christians. This stuff didn't just appear out of the mists. Neither did those early hermits.
Even the hermits in the early days of monasticism came together as part of the church on Sunday.