Good, I think. Wearing a mask when in close confines to strangers seems like a sensible approach - although all passengers should be vaccinated and/or have a negative COVID test, so the risk is probably very low.
It's worth bearing in mind that the majority of the FR fleet is operated under Irish, Maltese or Polish registrations, only 2 are on the UK register - masks are legally required on Irish registered aircraft, for example. So it is probably easier to require them rather than expect people to work out if the flight is Ryanair, Ryanair UK, Buzz, Malta Air or Lauda Europe. easyJet will also have a similar issue - it appears that Austria requires FFP2 masks, not just any old face covering. There are also obligations for Ryanair and easyJet as employers - 2m distance cannot be maintained on an aircraft, there are no exemptions for crew under Irish or Austrian regulations, for example.