Why even buy games period? Why risk giving money to any of them since things that become popular risk making the people selling them to become wealthy? Not like indies are immune to it looking at Minecraft becoming too popular that too many people wanted to buy it making one person then a corporation wealthy, so why not just not buy period to prevent the issue from even becoming a possibility?
The best solution is prevention. Don't buy anything.
Not on Steam and not in ways that enrich billionaires. If devs don't make their game available another way then too bad, they chose to deal with the devil, I don't have to encourage them, won't keep me from playing their games through other means or by getting them through giveaways.