Reliable Talent says whenever you make an ability check that uses one of your skill or tool proficiencies, you can treat a d20 roll of 9 or lower as a 10. Alert gives you Initiative Proficiency allowing you to add your proficiency bonus to your initiative.
I suppose that since Reliable Talent says "skill or tool proficiencies" and Alert is technically a "feat proficiency," I assume that Reliable Talent does not apply to the Initiative Proficiency?
Your assumption is correct that it doesn't apply, but it's just a proficiency bonus that is applied to initiative. There's no such thing as a "feat proficiency".
Rollback Post to RevisionRollBack
How I'm posting based on text formatting: Mod Hat On - Mod Hat Off
Reliable Talent says whenever you make an ability check that uses one of your skill or tool proficiencies, you can treat a d20 roll of 9 or lower as a 10. Alert gives you Initiative Proficiency allowing you to add your proficiency bonus to your initiative.
I suppose that since Reliable Talent says "skill or tool proficiencies" and Alert is technically a "feat proficiency," I assume that Reliable Talent does not apply to the Initiative Proficiency?
Your assumption is correct that it doesn't apply, but it's just a proficiency bonus that is applied to initiative. There's no such thing as a "feat proficiency".
Homebrew Rules || Homebrew FAQ || Snippet Codes || Tooltips
DDB Guides & FAQs, Class Guides, Character Builds, Game Guides, Useful Websites, and WOTC Resources
A skill is an area of specialization associated with an ability check, but Initiative is just an ability check, not a skill.
So I'd say the two things don't interact.
EDIT: ninja'd by Sillvva!