I hate subscriptions. Are there lifetime plans where I pay once and never think about it again?

That's exactly what the Founder Lifetime plans are for — pay once, own it forever. Currently that means ₹19,999 for 100 GB, ₹24,999 for 500 GB, and ₹39,999 for 1 TB. They market the big one as maximum storage with zero renewals ever, which suits photographers who want to park years of client albums somewhere without a monthly bill hanging over their head. Obviously the upfront number looks bigger, but if you'd otherwise be paying yearly for a decade, the maths can work out in your favour.