If you only want to validate an idea or want to launch without knowing if it will be profitable, you don't have to pay from your pocket for a majority of cloud products. For the launch of my side project Mindible, I won't be using any paid cloud services. Let me show you how I can do so!
If you have a static frontend, you can use free services like Vercel or Netlify. Their free tiers are really enough for any small launching startup. I would recommend using Vercel since I used it myself for more than a year.
VPS / Virtual Instances
DigitalOcean can give you $100 for free when signing up for the first time to try their products. This way you could use their Droplets or other services for up to 60 days for free. Ideal to host your backend server for free.
If you are using MongoDB, this is for you! I found yesterday that there are tons of credits code (you can found them via Reddit) that you can apply to your account. Using this process, I got more than $600 of credits for cloud-hosted MongoDB: http://prntscr.com/xqvm40
There is also Firebase which is a really powerful cloud database that can help you with real-time features and online/offline synchronization. Their free tier is also pretty big.
Other Cloud services
Major cloud providers give you free credit and free services when signing up.
Take AWS, Azure or even GCP. Of course, this requires a bit of time to understand how it works, but it's still a good idea for a free Serverless endpoint for instance.
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The Oracle cloud infrastructure always free tier is worth a look if you can put aside past ideological differences with the corporate shell. oracle.com/cloud/free/
2 AMD based Compute VMs with 1/8 OCPU and 1 GB memory each or...
4 Arm-based Ampere A1 cores and 24 GB of memory usable as one VM or up to 4 VMs.
The arm option has been useful, 4 Arm cores and 24Gb of ram and 2 Block Volumes Storage of 200 GB total isn't something to pass up easily.
The only catch is entering a credit card on signup that doesn't get charged.
Considering it's without time limit (foreve, what ever that means) unlike AWS, it might be worth a try if you can forgive Oracle for their past.