Mr O'Leary is getting into the argument as well
https://www.bbc.co.uk/news/business-51140969
Again, a Google search for ryanair subsidy produces a wealth of articles about Ryanair receiving subsidy, or operating at airports alleged to be only sustainable with public subsidy, or facing accusations from rivals about unfair subsidy. It even has a marketing article on its own website telling some Spanish citizens they can claim 75% subsidy on their flight costs.
In one of the most astonishing details, the EU ruled that public subsidies on Ryanair flights between Angoulême and London in 2008 and 2009 were illegal and should be repaid. in Nov 2018 a Ryanair aircraft was seized at Bordeaux in order to force the airline to stump up the remaining half of the money it still hadn't repaid.