In short...
A bug bounty is a reward given to a person who discovers and reports a software security bug. The purpose of a bug bounty is to incentivize people to find and report security bugs, so that they can be fixed before they cause major problems. Bug bounties are often used in open source software projects, as well as by companies that want to crowdsource vulnerability research. This is very good for security because it means that many eyes are looking for issues, instead of just a few and it is very cost-effective too.
You don't need a bug bounty program to build projects as a solo founder, but it can be helpful to have one in order to make sure that your project is secure. You want it and your customer really need it. Especially today! Besides, it is one of the cheapest forms of insurance that you can buy, and it can give you peace of mind knowing that your project is safe from potential harmful vulnerabilities. And remember, you only have to reward when a bug is actually found!
There are many way to start a bug bounty program. You can always put your own twist on it to make it more unique and interesting to your potential hackers. Sometimes it is just as easy as putting up a page with your bug bounty terms and contact information. Other times, it is best to use an existing platform. Hackers like to hang out at platforms they trust but you need to be able to afford them. HackerOne, Bugcrowd and others are not cheap but there are some cheap and even free alternatives.
If you decide to go ahead with a bug bounty, always make sure that you have a clear scope and that you are offering reasonable rewards but you don't have to go big. Why not send some swag or clever gifts that hackers will love instead? Go wild and have fun with it. The most important thing is that you are taking care of your information security.
Last but not least, don't forget to show your appreciation to the people who helped make your project more secure. They are doing you a huge favor and they deserve to be recognized for it. Thank them publicly and often, and they will be more likely to help you again in the future.
If this is something that you are interested in, please reach out and let me know. I would be more than happy to chat with you about it and help you get started. I have quite extensive experience in this space as a researcher but also CISO in multiple companies and I can help you with the entire process from start to finish.