Second Life is not compliant with European law / RGPD with bots redirecting groups to discord or systems having links to HTTP servers etc. Legally compliance must be opted-in with a clear consent from the user i-e full explanation as what is the use and visibility of data going outside + tracing of when and what got consent on from each user.
Time for Linden Lab to regulate it or it could get serious fines to pay as well as legal constraints from Europe. In the same way the recent laws signed by President Biden could also result in serious legal problems.
Ideally there should also be a logo or so to explicitly visualize the fact that a group is linked to Discord or any other external media.