But we cannot just trust the DID doc alone. Because a user can claim to belong to that service while they don't. This can happen because they have full control over their did doc. For example, someone can have did doc pointing to bsky PDS while that PDS doesn't know about them.

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If you have a fediverse account, you can quote this note from your own instance. Search https://bsky.brid.gy/convert/ap/at://did:plc:xasnlahkri4ewmbuzly2rlc5/app.bsky.feed.post/3m6st4owau22d on your instance and quote it. (Note that quoting is not supported in Mastodon.)