It's complicated. It seems Airbnb was forced by some customer protection agency (UK iirc), to always offer the possibility to submit a review in the case of last minute cancellations. It's standard practice though that Airbnb considers reviews from guests who did not stay as irrelevant and removable when requested. OP should appeal the removal in their particular case. It's not impossible to reanimate removed reviews. However, generally, what Airbnb did here makes sense (else e.g. host's would suffer from retaliatory reviews when guests show up beyond check-in time and feel entitled). What people forget: by participating in reviews customers are more likely to engage with the product/plattform again (source: influence or pre-suasion by Robert Cialdini).