Does TSMC even have non-bulk customers at 7nm/5nm/4nm? I would have thought the mask costs are so high that it isn't economical except for the biggest companies.
7nm yes, 5nm/4nm not as much, apple pretty much bought out the entirety of 3nm. 7nm is a relatively mature process at this point.
Cerebras has probably bought less than 100 7nm wafers, total. Though they may have gotten many more sales than the last I checked. Tesla Dojo is probably about the same. I've seen loads of random chips like that on 7nm. I guess it depends what you consider "bulk".