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Simple Mobile Tools is being sold to a for-profit firm ZipoApps
(programming.dev)
Simple Mobile apps have been very popular among FOSS enthusiasts. I've personally been using the Gallery, Contacts and the Phone app since a few years now. It's a shame that it has come to this, will be on the lookout for their forks.
I would also recommend switching ASAP. You can make a backup of their internal data with App Manager (available from f-droid) which you can then restore to the f-droid version