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It's not so much about being open source or not, but rather how easy it is to set up, integrate and maintain. People know this so many companies offer their products as open source plus a nice hosted (usually marketed as "cloud") version for easy access. So your choice is between two clicks and paying a few bucks using company card vs. spending a few hours or in complex cases days dealing with setup, resolving dependencies, solving any problems that arise when you deal with any complex piece of software and so on. Moreover, you need to maintain it yourself, so again you have a choice of updating it with each new version to stay up to date, without any guarantee that there are no problems with each update, or withhold the updates - but then you risk either a security incident or delaying it so long that updating gets difficult. So for non-essential services it's a no-brainer, you just pay a bit and forget it. Especially if it's open source so in the worst case you can just migrate to a self-hosted solution as nobody holds your data (incl. configurations etc.) hostage.

It's quite different with core and expensive proprietary services though. In this case you better think and calculate everything precisely as you may regret going with a proprietary solution in the long run and switching can be painful.