Preface: this is retarded

There is literally no reason not to add an S when talking about multiple full coins, but i understand that some people feel strongly that you shouldn’t

“So-and-so has so much bitcoin” works and so does “so-and-so has so many bitcoins.” It is a choice and both options are valid, with slightly different meanings

The former could mean some relatively large fraction of one bitcoin while the latter makes it clear grammatically that there are 2+ whole coins being referred to

In my tongue in cheek comment, i specifically chose to imply using this grammatical option that even 21M would be too many, as there will ultimately be slightly less once all satoshis (or is it all satoshi? 🥴) have been issued