They don't. The Saudi's are desperate because their oil revenue is drying up.
Prices of crude have been so low, they've been losing money between 2015 - 2022, & their saving grace was Putin's war in Ukraine massively inflating oil revenues.
They have Agenda 2030 whereby they're desperate to complete several massive infrastructure projects whilst they still have the revenue rolling in. After this, Saudi will be floating on a precious resource, with fewer & fewer takers because of the global shift to renewable energy.
They need to diversify into other areas of business & a big part of this is attracting Western investment & expertise. HOWEVER, that's easier said than done in a country governed by Sharia Law, which routinely airs public beheadings, & where alcohol, pork, nicotine & living with an unmarried partner are illegal.
Attracting major sports stars as a distraction to their population, & the ensuing softening of their restrictive laws to enable this transformation, is proving problematic because of the push back from Conservative Clerics.
Mohammad Bin Salman has been utterly ruthless in defence of his modernisation programme. Ronaldo isn't married to his long-term partner, but this has been overlooked as the Saudi's look to attract the biggest stars in world football.
Quite what happens when economic reality kicks in after 2030, remains to be seen. For now, Saudi Arabia presents a clear & present danger in terms of attracting the world's biggest football stars, irrespective of what the PL & UEFA would have you believe. )(