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Hi,
from my experience there's a good chance that the "Unknown" devices are Apple Mail (macOS and iOS) entities with Mail protection enabled. The feature was introduced by Apple in September last year, so if you have look at tracking data from around that time you might be able to see less "Unknown" devices. (see https://blog.adobe.com/en/publish/2021/06/24/what-apples-mail-privacy-protection-means-for-email-mar... and https://www.litmus.com/blog/apple-mail-privacy-protection-for-marketers/)
Regarding the "Proxy" entries, this might be the Google image proxy. Google's Gmail as a similar feature like the Apple Mail privacy feature in place and this shows up as "Proxy". (see https://experienceleaguecommunities.adobe.com/t5/adobe-campaign-standard/proxy-device-in-quot-opens-...)
I don't see the Browser data in your screenshot, but this might also come back to the Apple Mail privacy switch.
Overall I would say the "Opens" metric becomes more or less irrelevant, because it does not really reflect the exact truth. I recommend customers to look at different metrics, like clicks or conversions.
Best regards, Tobias