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Proprietary software with code that's viewable is actively harmful. It's worse than being closed. If you read the source, and use it (or a very similar version derived from it) in your code, you're including a copyright violation into your code.

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You can still modify the code for personal and business use, as long as you’re not making money off of it, you’re fine. This is far better than it being closed source.

it may prevent me from hiring you, because i can't trust that you don't accidentally use something you learned from that code in your work

You can make money of it. You just can't use it to run a SaaS based on Sentry. This is a lot narrower than a general "non-compete" with a very minimal "non-commercial" restriction.

You can provide Sentry-as-a-service but you can't do so commercially.

You can use the Sentry code commercially but you can't use it to provide Sentry-as-a-service commercially.

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