Because he’s in them. But so are several other politicians (any party), along with business leaders, celebrities, foreign royalty/diplomats, and other influential figures.

Whatever is in there is bad enough to mar Trump and a lot of other people, but not explicit enough to have incentivized the Democrats to release it for a guaranteed 2024 win. It’s going to have a lot of record keeping of trips, gifts, etc. but probably will not have clear evidence of criminal activity, and people will be left debating which vague terms (“island cruise” or whatever) were code for trafficking customers.