garyt1957 don't some of / all of the majors automatically invite you back if you finish top 10?
The four majors have similar but different exemption categories - past champions, position in world rankings at specified dates, winners of other tournaments, year-end standings on the major tours, and high finishers from the previous year's event - but these tend to change over time. The USGA statement regarding this year's US Open and the players eligible to play was very carefully worded to say that there would be no changes for this year, and made no promises for the future.
That said, some of the players who have committed to LIV have significant exemptions under the current rules - winning any major earns a 5-year exemption into all of the majors, so it seems reasonable for (for example) Phil Mickelson, Dustin Johnson and Bryson DeChambeau to be able to play in the majors as recent major champions. (Not allowing LIV players otherwise exempt to play is likely to get messy legally, unless the organisers have a rock-solid legal case for excluding those individuals...)