Even for a small company in the software space, running your own self-hosted OSS stack isn't a big ask. I've spent ~80 hours over the past year setting up and running our stack. It's nothing too crazy[1] but it covers our needs with no ongoing fees and, more importantly, no outside dependencies to rely on.

[1] Proxmox hosting a virtual server running Ubuntu, providing Kimai, WeKan, Mattermost, Jitsi, Mediawiki, OpenVPN access, some Samba shares, source control, and comprehensive backups.