CleanMyMac X app now available. Cost to upgrade two Macs: $95 as a once-off payment. Or $40 now & $80 per year as a subscription. Ouch.
Viable alternative: Setapp subscription program. Around 120 apps available (I currently own 15 of them), always have the most recent update for each app. Cost, $10 per month or $9 per month if buying 12 month subscription.
Setapp is looking mighty attractive.