yes, there’s a github instance list, which is one of the top google result and it says “It doesn’t matter which instance you use” in bold, but that’s not true:

• 2 instances i joined ceased to exist after < 1 month
• 1 had the hardest captcha on earth and it just stopped showing after the 3rd try and the register form would no longer work without it
• some need you to fill out an application message and don’t say what you’re supposed to put in. then a person needs to manually approve you based on that. that mechanism is not pleasant for everyone