Exactly! Those are only the tracked objects. The scary part is that there are many other objects around. The European satellite Sentinel-1A was hit in the solar panel by a piece of debris (changing the satellite position and reducing the power outcome). Photos of small impacts on the ISS and the MIR docunent that both meteoroids and atificial objects do hit our spacecraft. Probably the advance of technology and combining ground radars with other technologies (in orbit radars) could help catalogue a bigger numbers.

Regarding the active cleaning, it has proved being complicated. A Jaoanese mission carrying a tether to clean debris failed.. There is a European mission to try to catch a piece of a rocket booster that will be launched soon. Astroscale is a startup that got some attention lately because of their a mission in which they released a dummy satellite and trap it again with another catcher satellite using a magnetic system, that is a demonstrator of what could be used to trap and dormitorios satellites (bit probably only the ones ready for it. There are several technologies: harpoons, tethers, nets, magnets. None of them really tested and all of them with different specific user cases.

Then this problematic makes arise other problems on other levels. Objects are responsibility and can be claimed by the launching state, it is in a legal limbo if it is possible to take a piece of junk "property/respinsibility" of other state not collaborating. In fact, technologies related to the render vous and close operations (to retire a satellite or to service it to enlarge its life) have always been controversial because demonstrating their development involve also developing a technology that can be used to sabotage "enemy satellites".