I hope this directory will help you find the PeerTube platform (instances/servers) that fits your needs. I must say, I am a little worried how few platforms actually meet the criteria I've set. It's possible I've missed some, so please let me know in the comments. Enjoy.
General platforms
The following directory consists of PeerTube platforms that fits the following criteria:
A general platform.
Registration is open.
Follows (federates) at least 500 PeerTube platforms.
Provides some amount of storage space for users.
Dalek.zone
Infosec.Exchange Video
Freediverse.com
video.4d2.org
PeerTube.wtf
PeerTube.Anduin
Topic specific platforms
The following directory consists of PeerTube platforms (instances/servers) that fits the following criteria:
Registration is open.
Provides some amount of storage space for users.
Allows other platforms to follow (federate) it.
Please be aware that the following platforms are only recommended for content creators, as these platforms only follow a few PeerTube platforms. If you are a viewer, pick a general platform from above!
Hardlimit
MakerTube
LinuxRocks PeerTube
You should always go to a platforms /about page and read up on the rules and the features enabled on the platform. In some cases, registration requires approval by moderators. If you are interested in streaming, also make sure to check if this feature is enabled on the platform you wish to register on.
Your list shows that out of currently 986 known instances only 6 are federated to more than 500 platforms. That not a lot, and show peertube is very fragmented.
You should explain what you mean with "Peertube platforms", are they instances or something else ?
I'm curious to know how you know they federated to x number of other "platforms". Is is shown on each "platforms" anywhere ?