There is now a beta version of non-custodial tips in - you need an Alby account or NWC running on an Umbrel. Lightsats will have no access to your sats - the withdrawal secret is given directly from the tipper to the recipient of the tip. Currently works for single tips only. Some things aren't as smooth for recipients as the custodial version, but it's great progress so far!
Lightsats⚡