Maybe different providers have varying length of time from last use and/or topup before they delete the SIM from their system and the customer thern ceases to be able to use it and also with a loss of any credit the SIM had.
I have a LYCA.ES SIM and the inactivty timescale from last use to when they delete it is 60 days. I also have a little used LYCA.UK SIM and that timescale is a more generous 90 days.
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