Some registrars will also try their luck. I remember a domain i had for 12 years for a heritage railway with Namecheap it was an org.uk, so governed by nominet.
then 1 day i notice the site was down with a holding page that was not mine, so i checked and found it failed to renew the day before even though on autorenew.
Namecheap were having no of it and tried to blame me ( the new registrant just happened to be in the same location as namecheap), so i contacted Nominet with all the details. namecheap could not provide nominet with any evidence i had been sent renewal emails ( which i had not received any) and they could not explain why i was not given any grace time, so nominet decided to take the domain off the new registrant and hand it to me. i them removed all my domains from namecheap.
never use them now.Blimey, that all sounds a bit dodgy!
We have quite a few clients who use namecheap as a registrar and never seem to have any issue with them, but you never know it seems.