Edit: Just learned about the existence of lemmynsfw.com. At the moment not compareable but its growing fast.

Only the NSFW-Content.

I live in germany, and i am not afraid of my government. They have ups and downs but overall its okay, i would say.

I would leave if i were CONSTANTLY afraid.

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Not comparable with instagram yet, but its growing fast https://pixelfed.org/servers . And for my interests it is more Than enough. I am no poweruser and follow only a few people, but if i wanted so, i could browse for hours in my subscription-feed.

Pixelfed (Instagram) and Mastodon (Twitter)

No. Because if your write Software for Android you rely on the Android Debug Bridge (in short ADB). So it is an necessary part for debugging your Software. And ADB always allows installing New Software.