Does Apple sell devices to tech startups?

Information on Apple's MDM (Mobile Device Management) program can be found here - Intro to mobile device management - Apple Support

For IT usage specifically - Mobile Device Management Settings for IT - Apple Support

For an official answer you need to ask Apple. You have asked in a forum of end users; Apple does not respond to that type of questions here.

Scroll to the bottom of the Apple Home Page and find the links under "For Business"

Apple absolutely will sell devices to a tech startup (they'll sell to anyone with money in an area where they deliver). MDM can vary from region to region. Some of the top ones on the market are Jamf Now, Jamf Pro, Mosyle, and Kandji.

You're welcome! Glad I could help.