in most cases, tools with subscriptions do not need more maintenance than products with a one-time purchase (don't know anything about this specific case, so dunno if it applies here). It's just that after adobe/jetbrains and others opened pandoras box, slowly but surely more and more devs try to make their tools to a continuous income stream...
It get's really silly to the point that a snipping app has a yearly subscription (xnip), calendars have subscriptions (fantastical) and many other tools which once would have been a $20-$30 purchase all now want $3-$10 a month.
Personally I'm sick of it. I'd rather go back to the 'old days'...