There's also the BSL. It specifically calls out competitive products. It automatically falls away for code older than a given time to another OSI license: https://en.wikipedia.org/wiki/Business_Source_License. Per the Wikipedia article this still has issues: contributors are handing over their work for to you for free for that duration, they can't use their own work for profit.

The AGPL does make your project extremely unattractive to competition, without affecting your contributors. The issue is that it is still possible to compete with you using it, so long as your competition releases all their code (i.e. infra, billing, etc.) under AGPL.

I would personally go for AGPL because it will keep the worst offenders (Amazon, Microsoft) away from your code.