No these people didn't have me blocked. I had copied and pasted the same message inviting them to a thread, maybe it triggered a spam filter or something? Or is there an actual messaging limit per/day?
Maybe it's a precaution against those bitc0in bots or something. I guess I'll habe to add a ln extra random period at the end of each subsequent message then.
Is there a PM limit or something? I had just PMed about 6 people and all of a sudden it then said "unable to message with this account".