Because cryptocurrency losses are capital losses, there is a limit on how much loss may be claimed on the return. You are allowed to claim up to $3000 of loss above and beyond any capital gains you may have. The losses do not go away; rather they carry forward and can be used in future years against other capital gains, or, if none, an additional $3,000 loss may then be taken. This will continue until the losses are used up under current tax law.
You probably didn't see any change in your return because of the losses carrying forward from last year. Since these amounts may have already been calculated in your return, calculating additional loss doesn't have a direct impact on your return this year, but will increase the losses you will carry forward to a future year.
This FAQ describes this subject in a little more detail: https://ttlc.intuit.com/replies/4789424
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