Thanks for your question and welcome to the Qlik Community.
The app shared by the Plus user is still view-able by the Basic user. The restriction / limit on app size and storage is for the Plus user account. It should not have any effect on those users viewing it.
Please let me know how else we can help.
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Hi Manuel - to be clear - for Qlik Sense Cloud Business - YOU CAN ONLY SHARE with those that have a subscription seat. So though you can invite anyone - you are paying for that seat and you have the option to control what they see by separating apps among 3 streams. Where as with PLUS you can share unlimited number of users - BUT they all see what you put in your shared stream.
Let me know if you need any more clarification.
If you have not scene these yet - give them a look as well: