However - they are now lying through their teeth - they do not want anything to do with projects that do not give them money.
For examples, see:
They seem to offer some free credits - but those are not replenishable and since it does not seem to be possible to make contact with a human at Travis to arrange “OSS Credits” once they run out your FOSS project will be screwed.
For several years Travis had been the go to platform for CI for a multi-plaform FOSS project - but since Idera stepped it it seems that they are just squeezing Travis’s assets (and the paying commercial customers) until there will just be an empty husk left…
A FOSS project coder that has now switched from Travis to a workable platform.