I'm a bit surprised given his results this year - he isn't even 2nd in the standings any more. But I believe he does come with significant sponsorship!
And Red Bull obviously seem to prefer to have one star driver with a decent, but not spectacular, Number 2 much like Ferrari with Schumacher and Massa or Mercedes with Hamilton and Bottas.
For a spectator the McLaren approach is much more exciting with Norris and Piastri, or in years gone by Prost and Senna, Hamilton and Alonso.
Mercedes did the same for a while with Hamilton and Rosberg, and currently Hamilton and Russell but it can make life difficult for the teams.
It will be interesting to see if Perez gets to the end of will survive the 2026 season at Red Bull though!