for everyone praising the severance package, laid off employees at kickstarter are getting even more severance and full healthcare (not COBRA) because they unionized: https://twitter.com/ksr_united/status/1256382357311012871
aside from that, assuming that non-engineers get paid better at Airbnb than elsewhere is a big assumption.
With regards to COBRA, the premiums are certainly covered by AirBnb as COBRA is available to employees for 18 months by default and 36 months in California where AirBnb is headquartered.