OK, who can recommend a domain name registrar that:

- Is boring and dependable and has a rock solid track record
- Has a really good UI, including on mobile
- Supports as many TLDs as possible
- Isn't likely to get acquired by someone else
- Ideally supports multiple payment methods as insurance against accidental card expiry

I'd settled on Google Domains... but they just sold themselves to Squarespace! https://9to5google.com/2023/06/15/google-domains-squarespace/

Google Domains shutting down, assets sold and being migrated to Squarespace

Google Domains is "winding down following a transition period," with Squarespace taking over the business and assets...

9to5Google
@simon I used to use Namecheap, but they started not being cheap, so moved everything to Dynadot.com 5 years ago. Been super happy with them, have good prices, and seem to fit everything you mentioned: have over a dozen payment options, support all the TLDs I've looked at, manage over 4.5MM domains and explicitly say "no plans to go public or become acquired by a faceless corporation."