Salesforce/Slack in SaaS

Hey All!

I'm seeing a slew of new tools out there that talk about bridging the GAP between Salesforce and Slack/MS Teams.

What's interesting is that I know nearly anyone that knows basic app development can create a Salesforce marketplace app and Slack app and get them synced bi-laterally.

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Am I missing something here on where the complication of this might actually require paying a SaaS company tens of thousands of dollars per year instead of paying someone on Upwork 5K to do it ourselves?

Here are some examples of what I'm talking about:

https://www.gorattle.com/

https://www.troops.ai/

https://scratchpad.com/

https://www.dooly.ai/

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Am I missing something here, or are these pretty vanilla setups that teams pay for just because they don't want to create their own thing and like that it's "out of the box"?