I normally leave them alone, even encourage them to grow (I like them
too), but I draw the line when they start smothering my Utrics. Our
liverworts have small cup-like growths which hold gemmae or
spore-packets, with the usual ground hugging leaves with undersides
covered in fine roots. I haven't had any of the "star-growing" species
for quite a while.
BTW, picking them out of the pots seems to have worked - although
there's still some small plants in there which are likely to take off
again soon :-(