Liquid has not attracted as much interest as it might because it is under full control of a quorum of businesses. N out of M (I think it's something like 8 out of 15 I forget) have to sign to get your money out.
It's not the worst model (and people are advocating for something similar on a smaller scale with Fedimint), but a large proportion of people don't want to trust their BTC to others. So people want sidechains where you can withdraw without any consent.