Is there a limit in a day to the number of accounts I can sponsor in Hive SBI? How about sponsoring my wife and second son's accounts? Is this allowed?

I think around two days ago, I came across two Hivians who are somehow related to Hive SBI. I struggle to understand how this token works, so today I am doing a test by sending one $HIVE to Hive account@steembasicincome sponsoring Hive account@greywarden100. However, these questions bother me:

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