Things that make you go hmmm: Do crypto key servers violate GDPR? One does not simply 'remove' data from key servers July 5, 2018 https://www.theregister.co.uk/2018/07/05/pgp_key_servers_gdpr/
The inability to delete is a concern. Both about old keys, and about spoofed keys. Say if someone created and uploaded a key for mirimir@riseup.net. Maybe they could manage to spoof the email address well enough to trick one of my correspondents. But I would have no way to prove ownership, and have the key deleted. That's one reason why I prefer Keybase.
