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Re:The IRS collects data on Coinbase account holders by rrdharan on Friday March 16, 2018 @10:44AM (#16600988)
It depends on your definition of “care”. As other comments have noted, you might get a letter. History suggests they would not be likely to attempt to prosecute you for tax evasion.

https://www.hrblock.com/tax-center/irs/tax-responsibilities/...

They do have a limited budget for enforcement and they prioritize accordingly.

Re:The IRS collects data on Coinbase account holders by floatingatoll on Friday March 16, 2018 @12:12PM (#16601588)
The letters described are for correctable human mistakes that can be detected by math crosschecking and fixed by a letter. If they decide you are trying to avoid paying taxes on Bitcoin, and they decide to be upset about that, they would likely initiate an audit instead of a form letter — the serious, investigator, difficult kind.