In the case of "Maxis going independent" if EA still owns The Sims IP, this will mean at least 5 years of development starting from scratch (From example Life By You development started in 2019) in order to get a shell of game like inZOI. Meaning no game before 2031.
Microsoft Xbox, NetEase, Tencent and Sony, these big publishers are as greedy as EA. Since Bethesda is owned by Microsoft, it became almost as bad as BioWare.
The Sims won't be better or safe there. European companies would be a better solution but they aren't as rich (EU company annual revenues less than $3 billion vs over $10 billion for US/China).
Note : Keep in mind The Sims FreePlay is developed by The Firemonkeys studios/EA Mobile, The Sims isn't only about Maxis.