PGA limits and PL/SQL Arrays

a very basic question this time:
Suppose I have a large number of sessions and each of those are running a PL/SQL code that fills a PL/SQL array, such that PGA_LIMIT is jeopardized.
Can the database under such circumstance prevent PGA from overshooting the LIMIT?
I suppose no, when I read: *SYS processes and background processes other than job queue processes will not be subjected to any of the actions described in this section. Instead, if they are using the most untunable memory, they will periodically write a brief summary of their PGA usage to a trace file.*
(https://docs.oracle.com/en/database/oracle/oracle-database/21/refrn/PGA_AGGREGATE_LIMIT.html#GUID-E364D0E5-19F2-4081-B55E-131DF09CFDB3) I happy to learn more on this topic though.

Thanks

Lothar

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