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This question already has an answer here:

Proprietary snaps contributed by a particular entity were removed from the snap store as described in How to ask to ban the application for security reasons?.

What cautions should users take before installing proprietary snaps?

marked as duplicate by muru, DK Bose, Community May 14 '18 at 2:11

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    Only download from trusted sources and depending on your level of concern test it in a VM or other sandbox. – Panther May 14 '18 at 1:57
  • (Even though for debs, much of that is applicable to snaps or, for that matter, any packaging format.) – muru May 14 '18 at 2:05
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I'm going to give you the same exact suggestions we (the community) would give for "random PPAs":

Only use trusted sources for Snaps (rather than 'random suggestions') and if you really are concerned, test in an isolated VM or other isolated system/sandbox before putting it on a production machine to see if the snap does anything 'malicious'.

Beyond this step, there's no real way to properly 'vet' Snaps on the catalog for 'maliciousness'. If you find such a snap, though, you should report it to Canonical for immediate removal, and they can be pretty swift with that. (The same goes for PPAs, within 24 hours they can erase such a malicious PPA).

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