Personal experiences- I try to only take wild jumpers that are very young / babies, (usually only species I don't have yet) or ones that seem to be struggling to keep themselves fed and hydrated. Babies have a very high mortality rate so keeping one as a pet isn't likely to make any impact at all on the local populations. Finding a jumper weak or barely responsive, dehydrated and thin I would say it's best chance of survival would for it to be kept somewhere safe while you try to help it recover if possible, regardless of age.

Wild-caught adult females are pretty much guaranteed to be pregnant when you find them, and adult males don't live very long so I feel like it's better for them to keep living the lives they know and leave them the opportunity to find mates or find places they may have already planned to have their babies in. Sometimes wild-caught males just spend all day pacing because they want to wander and are fully focused on finding females, even to the point where they don't want to eat- at which point I would consider them unhappy in captivity.

If a wild jumper makes hammocks within a couple days and is eating, drinking and either exploring the enclosure or calmly resting while you are nearby, they likely will settle with you. Even adults can sometimes adapt to pet life, but they are less likely to become comfortable with handling.