The legal definition of monopoly in some jurisdictions means anyone with a large enough of a market share able to influence pricing, etc in a market. A market share as low as 25% can be called a monopoly. Does HBO+Netflix have a 25% share of the streaming market? I've no idea, but possibly.
But none of the streaming services are competing because they don't offer the same products, by design. Nobody is switching from Apple TV to Netflix because they don't share any shows - they buy both.
> Does HBO+Netflix have a 25% share of the streaming market? I've no idea, but possibly.
No, not even close. According to Nielsen from this year, Netflix has only 7.5% of total TV hours and "Warner Bros + Discovery" clocks in at 1.5% ("HBO" as an independent entity is not tracked), for a total of 9%. A whopping 16% to go before crossing that 25% threshold.
