I read an article on this a while back that made me refrain from actually getting bees. I can’t find it right now, but the gist is that domesticated honeybees will compete with a lot of other pollinators (mainly solitary bees) over the exact same food sources.

However, the honeybees have a gigantic advantage in being supervised, housed and generally looked after by the apiary. Which will also employ methods to stimulate hive-growth, driving the hives demand for food.

That is something a solitary bee - or another pollinator depending on the same nutrition - cannot compete with, driving them away.

So, in a nutshell: adding bees to a place already rich in honeybees? Whatever. Adding honeybees into a local ecosystem not having them rn? That will drastically lower biodiversity