You should probably call the IRS tipline and say "I think [Schwab] isn't filing their 1099-Bs, you know the thing which reports cost bases and short-term/long-term capital gains for retail investors, and accordingly they're on the hook for billions of dollars of penalties, but to keep the math easy just write me a check for a billion dollars rather than what the law actually says you owe me for this hot tip."
Or, in the alternative, you could look again.
I checked again, and you're right. Interactive Brokers is the only platform I still infrequently use but it does have a list of pre-filled tax forms available for download. Worksheet 8949 is also pre-filled, but this is probably where one would need to submit a revised version if previous cost-basis amounts need to be adjusted as in the specific edge cases we're talking about above.
Coinbase seems to have sent 1099-K documents to eligible customers which isn't as detailed as 1099-Bs since I believe the Ks only report gross transaction volumes over $20K[1].
[1] https://www.irs.gov/businesses/understanding-your-1099-k
https://www.irs.gov/businesses/small-businesses-self-employe...
I cannot account for the discrepancy, but I use Charles Schwab, and it absolutely DOES calculate and display capital gains. In cases where I have moved a security into the account (rather than purchasing it directly within the account) I have had to provide original cost basis information for them in order for the calculations to be correct.
>>This is a solved problem, cryptocurrency is not special. If they have the cost basis they can tell you, if not, they can leave it blank.
We're in agreement - this is a solved problem that the retail investor or their accountant needs to calculate manually via aggregation of the entire lifecycle of the asset(s) to properly account for capital gains (or losses).