You can give unique throwaway addresses to people you don't fully trust (e.g. newsletters, recruiters) and apply the rules you want. It would be very naive to think that Big Tech won't abuse their market positions.
Also it's funny to see people react to their business name being in my email :P .
And I had no way to apply for the government licence thing I needed, and the people on the phone suggested I use the website.
On one occasion, I was checking into a Hilton hotel and the employee thought I worked for corporate due to my email, hilton@domain.tld.
In the past, I used to explain to them how I control the domain and I have separate emails for every company due to spam reasons. However, this usually caused confusion so now I sometimes go along with what they think or hint that I'm some 'mystery shopper'.