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CS was paid, Dota and Fortnite had “early access” packs before being released. Yeah fortnite is the odd one out here with keeping early access stuff to seperate gamemode and still costing money, but was originally planned to transition to f2p.
Dota was always going to be f2p, and maybe you could buy the beta access, but I, like many others, never paid and just got invited. So I would not consider it to be a paid game going f2p