I've started using my own domain to avoid giving out my "real" addresseverywhere. It doesn't always work, but it usually does.
Such as WHOIS info (if not cloaked), or an algorithm may assume I'm a business and charge me higher prices, etc. I used to get marketing spam from Dropbox saying that many of my coworkers enjoy using it and to upgrade -- but I was the only user on that domain name.
I wouldn’t consider this a legitimate concern. Whois privacy is common and often free for nearly all registrars (barring TLDs which disallow this)
> May assume I’m a business
I really doubt this happens frequently, at least far more infrequently than a business using your permanent email for spam. Besides, if the algorithm decides that any non-gmail/outlook/yahoo/etc mail is “business”, then they’re going to assume that about any disposable email.
Personally, I find the $4/year I spend on a domain name to be incredibly worth it and the downsides are far fewer than the upsides.
(Obviously anything at a domain I own is directly associable to me, and for many trashwalls I still prefer to use mailinator etc)
Surprisingly, the game Eve Online was super-strict in refusing these types of addresses. Most other services were fine though.
With EVE, fraud comes in many ways and most would presume credit card fraud but because you can earn ISK in-game, which can be converted/sold for PLEX (their game-time subscription currency, worth real $) many items (Capital Ships, High Experience Characters, Corporations) are bought and sold for real money outside of the platform - which in some cases, is revenue that EVE would/could benefit from if PLEX was purchased from them directly and used legitimately instead.
So aside from basic things like blocking utility email addresses, they have sophisticated algorithms that monitor user accounts for unusual activity. The definition of unusual is constantly growing/changing and it is monitored and managed by a dedicated "security" team.
Source: Friend of friend works in that security team.