Avoid paradoxes is likely the one thing even someone trying to change the past needs / wants to accomplish.
It'd be nice if some tiny pool of government resources (everywhere) were set aside in 'untraceable' ways that only someone from many years later could use, by which time any untapped resources would be rolled into a new investment area or returned to the general fund.
The non time traveler version would be completely off the books spy operations, so plausibly someone might rarely need that for non-time traveler reasons and thus hide any time travelers.
It'd be nice if some tiny pool of government resources (everywhere) were set aside in 'untraceable' ways that only someone from many years later could use, by which time any untapped resources would be rolled into a new investment area or returned to the general fund.
The non time traveler version would be completely off the books spy operations, so plausibly someone might rarely need that for non-time traveler reasons and thus hide any time travelers.