I wouldn't tie my entire digital identity to whatever's cheapest if I could avoid it.
In my case I use my CC TLD. I'm in a generally stable nation that follows the rule of law and the administrator of the CC TLD has all sorts of processes in place that I have access to as far as regaining control of the domain if it's inappropriately transferred, making appeals, etc.
The extra $10 or so a year this costs is very much worth it to me as basically a form of insurance.
like Hamuko said, there are domains like .party, etc that are cheap. However, some sites won't take them. My main junk account is a wildcard .party domain. It'll work with mosts sites, but the odd one won't take them. I ended up registering a .com that goes to the same inbox to get around these.
In my case I use my CC TLD. I'm in a generally stable nation that follows the rule of law and the administrator of the CC TLD has all sorts of processes in place that I have access to as far as regaining control of the domain if it's inappropriately transferred, making appeals, etc.
The extra $10 or so a year this costs is very much worth it to me as basically a form of insurance.