Good questions 
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Discoverable: Currently, it does not really affect the project’s visibility. In the future, if enabled, it will allow the project to appear in various places, such as the public user profile, a home feed, a search functionality, etc. This is what we had originally thought, now that we’ve started working on support for organizations/workspaces/teams the behavior might change a bit…
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Requesting access: Currently no, but it’s a good feature we could consider once we get there.
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If a project is link-shared, anyone with the link can see it. Currently there is no way for viewers to request edit access to it, but (same as above) it’s something we could add.
If you have any other feedback on how you’d like to invite & collaborate on Speckle let us know!
Cc @benjavo