You can also get a free Oracle Cloud VPS, and Alibaba provides good cloud value also. Many years ago, I enrolled in Microsoft’s BizSpark program, and if they still do that, check them out. So many good options…
It's a bit weird to say considering it's oracle, but there's no catch and no hidden costs. As long as you don't upgrade to a paid account, there's no way to even mess up and get charged
If it switches at $10 worth of bandwidth, or even at $20, is that REALLY that much?
An equivalent low usage machine on AWS in us-east (t3a.micro - 1GB / shared CPU) on spot instead costs around $2.16, almost 57% less.
So this is where bandwidth becomes interesting, especially in combination with an external CDN.
Say if you're hosting 100 low volume client sites where each client gets its own instance (sensible security choice), DO you'd be paying $284/mo. more than equivalent AWS config, or you could treat the $284 as a bandwidth allowance, leaving 3.155 TB egress in aggregate across all clients before DO/AWS are breakeven again.
If some/many of those client sites consume a lot of bandwidth, the equation quickly changes, but you need to start looking at edge hit rates of an individual application before attempting to make a meaningful comparison.
The last project I looked at this for included several high bandwidth sites with good edge hit rates on an external CDNs, and AWS still came in significantly cheaper