If possible you should always try to have the email for your real name to use for business and government stuff.

Register a domain. Use all the emails. New one for everything. Uber sending spam? Blocked.

I have a Gmail for all important emails that's my real name. I'm very careful to only use it for important things. I never use it for online orders of any sort.

It's better to use a custom domain or no alias at all for important personal stuff, but if your goal isn't to be unidentifiable by the organization, then you can safely use your own name in the adresses. You will still have the advantage of spam control.

One downside I can think of is that the (government) organization will know that you use a particular aliasing service, which may be problematic in some situations.

Custom domain + SimpleLogin which generates a random alias (Tip: you can have emails forwarded to multiple "real" email addresses) + fake names and other personal info