Call me cynical, but I don’t expect these to be better alternatives for long. The main issue lies with the fact that these services are both centralized and profit-motivated, and I don’t anticipate that the EU’s privacy laws, though they are better than those in the US, will be much protection once even one of these competitors gets big enough to have a say in politics. Self-hosted, open-source apps are a far better solution than relying on yet another company that has full control of the software, especially with the barrier to entry for those apps getting smaller with each passing day.

There are multiple projects available that will let you turn even a mediocre extra PC into a platform for self-hosted apps with not a lot of effort. Yunohost and CasaOS are two that come to mind, but other options exist. Hell, even just running Nextcloud is probably enough to cover most people’s SaaS needs, though it can require a bit more work than the other two that I mentioned.