> ESA has its own rockets, which launch from its own facility and which are not drastically more expensive than Falcon 9
ESA's launch cadence does not permit populating a LEO constellation. On this, currently, America has a monopoly. (Soon, I expect, to be shared with China.)
Developing a reusable launch vehicle is not needed for a fast launch cadence. The expendable Soyuz family has had 2006 launches since 1957 [1]. That's one in just over 12 days, and in reality, the cadence has been a lot faster at times (for long, continuous stretches).
ESA's launch cadence does not permit populating a LEO constellation. On this, currently, America has a monopoly. (Soon, I expect, to be shared with China.)