Streaming rights change all the time. While Hulu holds the US rights for now, Disney has slowly been consolidating all of its adult content. It is not impossible that How I Met Your Mother could migrate to Disney+ in America someday—but for now, as Barney would say: "Wait for it..." (Dary).
The answer is complicated, and it depends entirely on where you live. how i met your mother disney plus
The show has recently seen a massive spike in streaming numbers, frequently appearing in the rankings for Disney+ in over 45 countries. Watch How I Met Your Mother | Full episodes | Disney+ Streaming rights change all the time