Well, we have “flushable” and “non-flushable” wipes.
I use flushables for myself - 1 at a time because I know that that only goes so far.
Baby wipes are NOT flushable. When our son was a baby not long ago, we just gathered them up with the trash (in diapers).
Possible someone put a bunch from a baby session down a toilet, but I also wonder if someone dumped fresh stacks of them, the way it was described the other day.
Your “flushable” wipes are the problem.
They are labeled “flushable”, but they raise Hell with sewage systems.
Whether they are flushed one at a time or a dozen at a time does not really matter. They will accumulate at certain locations in the collection system.
For instance, a very common configuration is to have small pipes feeding into a large manhole. The wipes will wind up accumulating in the manhole and build up over time until they stop up the works.
And don’t get me started on what these things do to sewage lift stations. If you have ever had to change a large sewage lift pump, you know that is one piece of equipment you want to last as long as possible. But a bunch of these wipes can accumulate and get into a macerating pump, and you have a burned out motor. Replacing a lift pump is a really nasty piece of work.