As stated in the earlier part of my posting, you can still use F360 for free under a 'Personal' license. Everything will be as it was under the old 'startup' license except for some features that most hobby folk would not have used anyway.
There are some of us though who have been caught out as a consequence of not fitting into the current license structure. For example, I have used F360 to build up a comprehensive library of obsolete parts for a particular marque of motorcycle in the '30's era. This is for the record, not for any commercial purpose as even when a few new parts are made to these drawings, they are one-offs for individuals at their own expense. It's more akin to a museum archive activity.
It has been useful to use the collaboration aspects up until now as some of the contributors are spread around the globe. Some of them also have access to professional CAD software whose files I need to translate.
With a library of many hundreds of parts, assemblies and drawings I have to choose either to continue for free with a few limitations or to pay for the commercial license.
As many of us have in effect been Beta testers for this software which is still evolving, I certainly would not want to pay full price for a license. This special offer is perhaps a worthwhile thing for people like me though, where so much effort has already been invested.
And yes, I do have backups in generic file formats and could migrate to my other CAD packages or indeed another. However, F360 does suit my needs very well and it's ability to back-track the timeline and edit within assemblies is very useful.
I have no wish to promote the product but when Ian asked his question I saw that he was possibly confused by what Autodesk were doing. The reduced price offering, if it were to suit him, is not well advertised and I thought that he should be advised of it.